src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java

@@ -17,7 +17,7 @@ import java.util.List;
 import java.util.UUID;
 import java.util.function.BiConsumer;
 
-import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators.valid;
+import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator.valid;
 import static net.hostsharing.hsadminng.mapper.PostgresDateRange.toPostgresDateRange;
 
 @RestController

src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemEntity.java

@@ -10,7 +10,6 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectEntity;
-import net.hostsharing.hsadminng.hs.validation.Validatable;
 import net.hostsharing.hsadminng.mapper.PatchableMapWrapper;
 import net.hostsharing.hsadminng.rbac.rbacdef.RbacView;
 import net.hostsharing.hsadminng.rbac.rbacdef.RbacView.SQL;
@@ -65,7 +64,7 @@ import static net.hostsharing.hsadminng.stringify.Stringify.stringify;
 @Setter
 @NoArgsConstructor
 @AllArgsConstructor
-public class HsBookingItemEntity implements Stringifyable, RbacObject, Validatable<HsBookingItemEntity, HsBookingItemType> {
+public class HsBookingItemEntity implements Stringifyable, RbacObject {
 
     private static Stringify<HsBookingItemEntity> stringify = stringify(HsBookingItemEntity.class)
             .withProp(HsBookingItemEntity::getProject)
@@ -157,16 +156,6 @@ public class HsBookingItemEntity implements Stringifyable, RbacObject, Validatab
         return parentItem == null ? null : parentItem.relatedProject();
     }
 
-    @Override
-    public String getPropertiesName() {
-        return "resources";
-    }
-
-    @Override
-    public Map<String, Object> getProperties() {
-        return resources;
-    }
-
     public HsBookingProjectEntity getRelatedProject() {
         return project != null ? project : parentItem.getRelatedProject();
     }

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsBookingItemEntityValidator.java

@@ -0,0 +1,120 @@
+package net.hostsharing.hsadminng.hs.booking.item.validators;
+
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
+import net.hostsharing.hsadminng.hs.validation.ValidatableProperty;
+
+import jakarta.validation.ValidationException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Supplier;
+
+import static java.util.Arrays.stream;
+import static java.util.Collections.emptyList;
+import static java.util.Optional.ofNullable;
+import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
+import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
+import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_WEBSPACE;
+import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.PRIVATE_CLOUD;
+
+public class HsBookingItemEntityValidator extends HsEntityValidator<HsBookingItemEntity> {
+
+    private static final Map<Enum<HsBookingItemType>, HsEntityValidator<HsBookingItemEntity>> validators = new HashMap<>();
+    static {
+        register(PRIVATE_CLOUD, new HsPrivateCloudBookingItemValidator());
+        register(CLOUD_SERVER, new HsCloudServerBookingItemValidator());
+        register(MANAGED_SERVER, new HsManagedServerBookingItemValidator());
+        register(MANAGED_WEBSPACE, new HsManagedWebspaceBookingItemValidator());
+    }
+
+    private static void register(final Enum<HsBookingItemType> type, final HsEntityValidator<HsBookingItemEntity> validator) {
+        stream(validator.propertyValidators).forEach( entry -> {
+            entry.verifyConsistency(Map.entry(type, validator));
+        });
+        validators.put(type, validator);
+    }
+
+    public static HsEntityValidator<HsBookingItemEntity> forType(final Enum<HsBookingItemType> type) {
+        if ( validators.containsKey(type)) {
+            return validators.get(type);
+        }
+        throw new IllegalArgumentException("no validator found for type " + type);
+    }
+
+    public static  Set<Enum<HsBookingItemType>> types() {
+        return validators.keySet();
+    }
+
+    public static HsBookingItemEntity valid(final HsBookingItemEntity entityToSave) {
+        final var violations = doValidate(entityToSave);
+        if (!violations.isEmpty()) {
+            throw new ValidationException(violations.toString());
+        }
+        return entityToSave;
+    }
+
+    public static List<String> doValidate(final HsBookingItemEntity bookingItem) {
+        return HsBookingItemEntityValidator.forType(bookingItem.getType()).validate(bookingItem);
+    }
+
+    public HsBookingItemEntityValidator(final ValidatableProperty<?>... properties) {
+        super(properties);
+    }
+
+    public List<String> validate(final HsBookingItemEntity bookingItem) {
+        return sequentiallyValidate(
+                () -> enrich(prefix(bookingItem.toShortString(), "resources"), validateProperties(bookingItem.getResources())),
+                () -> enrich(prefix(bookingItem.toShortString(), "parentItem"), optionallyValidate(bookingItem.getParentItem())),
+                () -> validateSubEntities(bookingItem)
+        );
+    }
+
+    private static List<String> optionallyValidate(final HsBookingItemEntity bookingItem) {
+        return bookingItem != null ? HsBookingItemEntityValidator.doValidate(bookingItem) : emptyList();
+    }
+
+    protected List<String> validateSubEntities(final HsBookingItemEntity bookingItem) {
+        return stream(propertyValidators)
+                .filter(propDef -> propDef.isTotalsValidator())
+                .map(prop -> validateMaxTotalValue(bookingItem, prop))
+                .filter(Objects::nonNull)
+                .toList();
+    }
+
+    @SafeVarargs
+    private List<String> sequentiallyValidate(final Supplier<List<String>>... validators) {
+        return stream(validators)
+                .map(Supplier::get)
+                .filter(violations -> !violations.isEmpty())
+                .findFirst()
+                .orElse(emptyList());
+    }
+
+    private String validateMaxTotalValue(
+            final HsBookingItemEntity bookingItem,
+            final ValidatableProperty<?> propDef) {
+        final var propName = propDef.propertyName();
+        final var propUnit = ofNullable(propDef.unit()).map(u -> " " + u).orElse("");
+        final var totalValue = ofNullable(bookingItem.getSubBookingItems()).orElse(emptyList())
+                .stream()
+                .map(subItem -> propDef.getValue(subItem.getResources()))
+                .map(HsBookingItemEntityValidator::toInteger)
+                .reduce(0, Integer::sum);
+        final var maxValue = toInteger(propDef.getValue(bookingItem.getResources()));
+        return totalValue > maxValue
+                ? "total %s is %d%s exceeds max total %s %d%s".formatted(
+                propName, totalValue, propUnit, propName, maxValue, propUnit)
+                : null;
+    }
+
+    private static Integer toInteger(final Object value) {
+        if (value instanceof Integer) {
+            return (Integer) value;
+        }
+        throw new IllegalArgumentException("Integer value expected, but got " + value);
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsBookingItemEntityValidators.java

@@ -1,57 +0,0 @@
-package net.hostsharing.hsadminng.hs.booking.item.validators;
-
-import lombok.experimental.UtilityClass;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
-
-import jakarta.validation.ValidationException;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import static java.util.Arrays.stream;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_WEBSPACE;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.PRIVATE_CLOUD;
-
-@UtilityClass
-public class HsBookingItemEntityValidators {
-
-    private static final Map<Enum<HsBookingItemType>, HsEntityValidator<HsBookingItemEntity, HsBookingItemType>> validators = new HashMap<>();
-    static {
-        register(PRIVATE_CLOUD, new HsPrivateCloudBookingItemValidator());
-        register(CLOUD_SERVER, new HsCloudServerBookingItemValidator());
-        register(MANAGED_SERVER, new HsManagedServerBookingItemValidator());
-        register(MANAGED_WEBSPACE, new HsManagedWebspaceBookingItemValidator());
-    }
-
-    private static void register(final Enum<HsBookingItemType> type, final HsEntityValidator<HsBookingItemEntity, HsBookingItemType> validator) {
-        stream(validator.propertyValidators).forEach( entry -> {
-            entry.verifyConsistency(Map.entry(type, validator));
-        });
-        validators.put(type, validator);
-    }
-
-    public static HsEntityValidator<HsBookingItemEntity, HsBookingItemType> forType(final Enum<HsBookingItemType> type) {
-        return validators.get(type);
-    }
-
-    public static  Set<Enum<HsBookingItemType>> types() {
-        return validators.keySet();
-    }
-
-    public static HsBookingItemEntity valid(final HsBookingItemEntity entityToSave) {
-        final var violations = validate(entityToSave);
-        if (!violations.isEmpty()) {
-            throw new ValidationException(violations.toString());
-        }
-        return entityToSave;
-    }
-
-    public static List<String> validate(final HsBookingItemEntity bookingItem) {
-        return HsBookingItemEntityValidators.forType(bookingItem.getType()).validate(bookingItem);
-    }
-}

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsCloudServerBookingItemValidator.java

@@ -1,15 +1,13 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
 import java.util.List;
 
-import static net.hostsharing.hsadminng.hs.validation.EnumerationPropertyValidator.enumerationProperty;
+import static net.hostsharing.hsadminng.hs.validation.EnumerationProperty.enumerationProperty;
-import static net.hostsharing.hsadminng.hs.validation.IntegerPropertyValidator.integerProperty;
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
 
-class HsCloudServerBookingItemValidator extends HsEntityValidator<HsBookingItemEntity, HsBookingItemType> {
+class HsCloudServerBookingItemValidator extends HsBookingItemEntityValidator {
 
     HsCloudServerBookingItemValidator() {
         super(

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsManagedServerBookingItemValidator.java

@@ -1,16 +1,14 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
 import java.util.List;
 
-import static net.hostsharing.hsadminng.hs.validation.BooleanPropertyValidator.booleanProperty;
+import static net.hostsharing.hsadminng.hs.validation.BooleanProperty.booleanProperty;
-import static net.hostsharing.hsadminng.hs.validation.EnumerationPropertyValidator.enumerationProperty;
+import static net.hostsharing.hsadminng.hs.validation.EnumerationProperty.enumerationProperty;
-import static net.hostsharing.hsadminng.hs.validation.IntegerPropertyValidator.integerProperty;
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
 
-class HsManagedServerBookingItemValidator extends HsEntityValidator<HsBookingItemEntity, HsBookingItemType> {
+class HsManagedServerBookingItemValidator extends HsBookingItemEntityValidator {
 
     HsManagedServerBookingItemValidator() {
         super(

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsManagedWebspaceBookingItemValidator.java

@@ -1,24 +1,47 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import java.util.List;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
+import static java.util.Collections.emptyList;
+import static net.hostsharing.hsadminng.hs.validation.BooleanProperty.booleanProperty;
+import static net.hostsharing.hsadminng.hs.validation.EnumerationProperty.enumerationProperty;
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
 
-import static net.hostsharing.hsadminng.hs.validation.BooleanPropertyValidator.booleanProperty;
+class HsManagedWebspaceBookingItemValidator extends HsBookingItemEntityValidator {
-import static net.hostsharing.hsadminng.hs.validation.EnumerationPropertyValidator.enumerationProperty;
-import static net.hostsharing.hsadminng.hs.validation.IntegerPropertyValidator.integerProperty;
-
-class HsManagedWebspaceBookingItemValidator extends HsEntityValidator<HsBookingItemEntity, HsBookingItemType> {
 
     public HsManagedWebspaceBookingItemValidator() {
         super(
             integerProperty("SSD").unit("GB").min(1).max(100).step(1).required(),
             integerProperty("HDD").unit("GB").min(0).max(250).step(10).optional(),
             integerProperty("Traffic").unit("GB").min(10).max(1000).step(10).required(),
-            enumerationProperty("SLA-Platform").values("BASIC", "EXT24H").optional(),
+            integerProperty("MultiOptions").min(1).max(100).step(1).required()
+                    .asTotalLimitFor( 25, HsManagedWebspaceBookingItemValidator::totalUnixUsers)
+                    .asTotalLimitFor(  5, HsManagedWebspaceBookingItemValidator::totalDatabaseUsers)
+                    .asTotalLimitFor(  5, HsManagedWebspaceBookingItemValidator::totalDatabases)
+                    .asTotalLimitFor(250, HsManagedWebspaceBookingItemValidator::totalEMailAddresses),
             integerProperty("Daemons").min(0).max(10).optional(),
-            booleanProperty("Online Office Server").optional()
+            booleanProperty("Online Office Server").optional(),
+            enumerationProperty("SLA-Platform").values("BASIC", "EXT24H").optional()
         );
     }
+
+    private static List<String> totalUnixUsers() {
+        // FIXME: implement
+        return emptyList();
+    }
+
+    private static List<String> totalDatabaseUsers() {
+        // FIXME: implement
+        return emptyList();
+    }
+
+    private static List<String> totalDatabases() {
+        // FIXME: implement
+        return emptyList();
+    }
+
+    private static List<String> totalEMailAddresses() {
+        // FIXME: implement
+        return emptyList();
+    }
 }

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsPrivateCloudBookingItemValidator.java

@@ -1,37 +1,18 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import static net.hostsharing.hsadminng.hs.validation.EnumerationProperty.enumerationProperty;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
-import java.util.List;
+class HsPrivateCloudBookingItemValidator extends HsBookingItemEntityValidator {
-
-import static java.util.EnumSet.of;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
-import static net.hostsharing.hsadminng.hs.validation.EnumerationPropertyValidator.enumerationProperty;
-import static net.hostsharing.hsadminng.hs.validation.IntegerPropertyValidator.integerProperty;
-
-class HsPrivateCloudBookingItemValidator extends HsEntityValidator<HsBookingItemEntity, HsBookingItemType> {
 
     HsPrivateCloudBookingItemValidator() {
         super(
-            integerProperty("CPUs").min(4).max(128).required(),
+            integerProperty("CPUs").min(4).max(128).required().asTotalLimit(),
-            integerProperty("RAM").unit("GB").min(4).max(512).required(),
+            integerProperty("RAM").unit("GB").min(4).max(512).required().asTotalLimit(),
-            integerProperty("SSD").unit("GB").min(100).max(4000).step(25).required(),
+            integerProperty("SSD").unit("GB").min(100).max(4000).step(25).required().asTotalLimit(),
-            integerProperty("HDD").unit("GB").min(0).max(16000).step(25).optional(),
+            integerProperty("HDD").unit("GB").min(0).max(16000).step(25).withDefault(0).asTotalLimit(),
-            integerProperty("Traffic").unit("GB").min(1000).max(40000).step(250).required(),
+            integerProperty("Traffic").unit("GB").min(1000).max(40000).step(250).required().asTotalLimit(),
-            enumerationProperty("SLA-Infrastructure").values("BASIC", "EXT8H", "EXT4H", "EXT2H").optional()
+            enumerationProperty("SLA-Infrastructure").values("BASIC", "EXT8H", "EXT4H", "EXT2H").withDefault("BASIC")
         );
     }
-
-    @Override
-    public List<String> validate(final HsBookingItemEntity privateCloudBookingItem) {
-        final var selfValidation = super.validate(privateCloudBookingItem);
-        return !selfValidation.isEmpty() ? selfValidation : validateSubEntities(privateCloudBookingItem);
-    }
-
-    private List<String> validateSubEntities(final HsBookingItemEntity privateCloudBookingItem) {
-        return validateSubEntities(privateCloudBookingItem, of(CLOUD_SERVER, MANAGED_SERVER));
-    }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetEntity.java

@@ -8,7 +8,6 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.validation.Validatable;
 import net.hostsharing.hsadminng.mapper.PatchableMapWrapper;
 import net.hostsharing.hsadminng.rbac.rbacdef.RbacView;
 import net.hostsharing.hsadminng.rbac.rbacdef.RbacView.SQL;
@@ -56,7 +55,7 @@ import static net.hostsharing.hsadminng.stringify.Stringify.stringify;
 @Setter
 @NoArgsConstructor
 @AllArgsConstructor
-public class HsHostingAssetEntity implements Stringifyable, RbacObject, Validatable<HsHostingAssetEntity, HsHostingAssetType> {
+public class HsHostingAssetEntity implements Stringifyable, RbacObject {
 
     private static Stringify<HsHostingAssetEntity> stringify = stringify(HsHostingAssetEntity.class)
             .withProp(HsHostingAssetEntity::getType)
@@ -114,16 +113,6 @@ public class HsHostingAssetEntity implements Stringifyable, RbacObject, Validata
         PatchableMapWrapper.of(configWrapper, (newWrapper) -> {configWrapper = newWrapper; }, config).assign(newConfg);
     }
 
-    @Override
-    public String getPropertiesName() {
-        return "config";
-    }
-
-    @Override
-    public Map<String, Object> getProperties() {
-        return config;
-    }
-
     @Override
     public String toString() {
         return stringify.apply(this);

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsHostingAssetEntityValidator.java

@@ -1,10 +1,11 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators;
+import net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
+import net.hostsharing.hsadminng.hs.validation.ValidatableProperty;
 import org.apache.commons.collections4.ListUtils;
 
 import jakarta.validation.ValidationException;
@@ -19,23 +20,23 @@ import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.CLOU
 import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MANAGED_SERVER;
 import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MANAGED_WEBSPACE;
 
-public class HsHostingAssetEntityValidator extends HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType> {
+public class HsHostingAssetEntityValidator extends HsEntityValidator<HsHostingAssetEntity> {
 
-    private static final Map<Enum<HsHostingAssetType>, HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType>> validators = new HashMap<>();
+    private static final Map<Enum<HsHostingAssetType>, HsEntityValidator<HsHostingAssetEntity>> validators = new HashMap<>();
     static {
-        register(CLOUD_SERVER, new HsEntityValidator<>());
+        register(CLOUD_SERVER, new HsHostingAssetEntityValidator());
         register(MANAGED_SERVER, new HsManagedServerHostingAssetValidator());
         register(MANAGED_WEBSPACE, new HsManagedWebspaceHostingAssetValidator());
     }
 
-    private static void register(final Enum<HsHostingAssetType> type, final HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType> validator) {
+    private static void register(final Enum<HsHostingAssetType> type, final HsEntityValidator<HsHostingAssetEntity> validator) {
         stream(validator.propertyValidators).forEach( entry -> {
             entry.verifyConsistency(Map.entry(type, validator));
         });
         validators.put(type, validator);
     }
 
-    public static HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType> forType(final Enum<HsHostingAssetType> type) {
+    public static HsEntityValidator<HsHostingAssetEntity> forType(final Enum<HsHostingAssetType> type) {
         return validators.get(type);
     }
 
@@ -51,9 +52,15 @@ public class HsHostingAssetEntityValidator extends HsEntityValidator<HsHostingAs
         return entityToSave;
     }
 
+    @SafeVarargs
+    public HsHostingAssetEntityValidator(final ValidatableProperty<?>... properties) {
+        super(properties);
+    }
+
+
     @Override
     public List<String> validate(final HsHostingAssetEntity assetEntity) {
-        final var selfValidation = super.validate(assetEntity);
+        final var selfValidation = enrich(prefix(assetEntity.toShortString(), "config"), validateProperties(assetEntity.getConfig()));
         return selfValidation.isEmpty()
                 // higher levels are only validated with valid sub-entity
                 ? ListUtils.union(
@@ -67,6 +74,6 @@ public class HsHostingAssetEntityValidator extends HsEntityValidator<HsHostingAs
     }
 
     private static List<String> optionallyValidate(final HsBookingItemEntity bookingItem) {
-        return bookingItem != null ? HsBookingItemEntityValidators.validate(bookingItem) : emptyList();
+        return bookingItem != null ? HsBookingItemEntityValidator.doValidate(bookingItem) : emptyList();
     }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsManagedServerHostingAssetValidator.java

@@ -1,12 +1,8 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
-import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
-import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
-import static net.hostsharing.hsadminng.hs.validation.IntegerPropertyValidator.integerProperty;
+class HsManagedServerHostingAssetValidator extends HsHostingAssetEntityValidator {
-
-class HsManagedServerHostingAssetValidator extends HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType> {
 
     public HsManagedServerHostingAssetValidator() {
         super(

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsManagedWebspaceHostingAssetValidator.java

@@ -1,13 +1,11 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
-import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
-import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
 
 import java.util.List;
 
 
-class HsManagedWebspaceHostingAssetValidator extends HsEntityValidator<HsHostingAssetEntity, HsHostingAssetType> {
+class HsManagedWebspaceHostingAssetValidator extends HsHostingAssetEntityValidator {
     public HsManagedWebspaceHostingAssetValidator() {
     }
 

src/main/java/net/hostsharing/hsadminng/hs/validation/BooleanProperty.java

@@ -8,29 +8,29 @@ import java.util.Map;
 import java.util.Objects;
 
 @Setter
-public class BooleanPropertyValidator extends HsPropertyValidator<Boolean> {
+public class BooleanProperty extends ValidatableProperty<Boolean> {
 
     private Map.Entry<String, String> falseIf;
 
-    private BooleanPropertyValidator(final String propertyName) {
+    private BooleanProperty(final String propertyName) {
         super(Boolean.class, propertyName);
     }
 
-    public static BooleanPropertyValidator booleanProperty(final String propertyName) {
+    public static BooleanProperty booleanProperty(final String propertyName) {
-        return new BooleanPropertyValidator(propertyName);
+        return new BooleanProperty(propertyName);
     }
 
-    public HsPropertyValidator<Boolean> falseIf(final String refPropertyName, final String refPropertyValue) {
+    public ValidatableProperty<Boolean> falseIf(final String refPropertyName, final String refPropertyValue) {
         this.falseIf = new AbstractMap.SimpleImmutableEntry<>(refPropertyName, refPropertyValue);
         return this;
     }
 
     @Override
-    protected void validate(final ArrayList<String> result, final String propertiesName, final Boolean propValue, final Map<String, Object> props) {
+    protected void validate(final ArrayList<String> result, final Boolean propValue, final Map<String, Object> props) {
         if (falseIf != null && !Objects.equals(props.get(falseIf.getKey()), falseIf.getValue())) {
             if (propValue) {
-                result.add("'"+propertiesName+"." + propertyName + "' is expected to be false because " +
+                result.add(propertyName + " is expected to be false because " +
-                        propertiesName+"." + falseIf.getKey()+ "=" + falseIf.getValue() + " but is " + propValue);
+                        falseIf.getKey()+ "=" + falseIf.getValue() + " but is " + propValue);
             }
         }
     }

src/main/java/net/hostsharing/hsadminng/hs/validation/EnumerationProperty.java

@@ -0,0 +1,38 @@
+package net.hostsharing.hsadminng.hs.validation;
+
+import lombok.Setter;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Map;
+
+@Setter
+public class EnumerationProperty extends ValidatableProperty<String> {
+
+    private String[] values;
+
+    private EnumerationProperty(final String propertyName) {
+        super(String.class, propertyName);
+    }
+
+    public static EnumerationProperty enumerationProperty(final String propertyName) {
+        return new EnumerationProperty(propertyName);
+    }
+
+    public ValidatableProperty<String> values(final String... values) {
+        this.values = values;
+        return this;
+    }
+
+    @Override
+    protected void validate(final ArrayList<String> result, final String propValue, final Map<String, Object> props) {
+        if (Arrays.stream(values).noneMatch(v -> v.equals(propValue))) {
+            result.add(propertyName + " is expected to be one of " + Arrays.toString(values) + " but is '" + propValue + "'");
+        }
+    }
+
+    @Override
+    protected String simpleTypeName() {
+        return "enumeration";
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/validation/EnumerationPropertyValidator.java

@@ -1,38 +0,0 @@
-package net.hostsharing.hsadminng.hs.validation;
-
-import lombok.Setter;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Map;
-
-@Setter
-public class EnumerationPropertyValidator extends HsPropertyValidator<String> {
-
-    private String[] values;
-
-    private EnumerationPropertyValidator(final String propertyName) {
-        super(String.class, propertyName);
-    }
-
-    public static EnumerationPropertyValidator enumerationProperty(final String propertyName) {
-        return new EnumerationPropertyValidator(propertyName);
-    }
-
-    public HsPropertyValidator<String> values(final String... values) {
-        this.values = values;
-        return this;
-    }
-
-    @Override
-    protected void validate(final ArrayList<String> result, final String propertiesName, final String propValue, final Map<String, Object> props) {
-        if (Arrays.stream(values).noneMatch(v -> v.equals(propValue))) {
-            result.add("'"+propertiesName+"." + propertyName + "' is expected to be one of " + Arrays.toString(values) + " but is '" + propValue + "'");
-        }
-    }
-
-    @Override
-    protected String simpleTypeName() {
-        return "enumeration";
-    }
-}

src/main/java/net/hostsharing/hsadminng/hs/validation/HsEntityValidator.java

@@ -4,41 +4,36 @@ import com.fasterxml.jackson.annotation.JsonAutoDetect;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
+import net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator;
-import net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.EnumSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Objects;
 
 import static java.util.Arrays.stream;
 import static java.util.Collections.emptyList;
-import static java.util.Optional.ofNullable;
 
-public class HsEntityValidator<E extends Validatable<E, T>, T extends Enum<T>> {
+public abstract class HsEntityValidator<E> {
 
-    public final HsPropertyValidator<?>[] propertyValidators;
+    public final ValidatableProperty<?>[] propertyValidators;
 
-    public HsEntityValidator(final HsPropertyValidator<?>... validators) {
+    public HsEntityValidator(final ValidatableProperty<?>... validators) {
         propertyValidators = validators;
     }
 
-    public List<String> validate(final E assetEntity) {
+    protected static List<String> enrich(final String prefix, final List<String> messages) {
-        final var result = new ArrayList<String>();
+        return messages.stream()
-        assetEntity.getProperties().keySet().forEach( givenPropName -> {
+                .map(message -> prefix + "." + message)
-            if (stream(propertyValidators).map(pv -> pv.propertyName).noneMatch(propName -> propName.equals(givenPropName))) {
+                .toList();
-                result.add("'"+assetEntity.getPropertiesName()+"." + givenPropName + "' is not expected but is set to '" +assetEntity.getProperties().get(givenPropName) + "'");
     }
-        });
+
-        stream(propertyValidators).forEach(pv -> {
+    protected static String prefix(final String... parts) {
-          result.addAll(pv.validate(assetEntity.getPropertiesName(), assetEntity.getProperties()));
+        return String.join(".", parts);
-        });
-        return result;
     }
 
+    public abstract List<String> validate(final E entity);
+
     public final List<Map<String, Object>> properties() {
         final var mapper = new ObjectMapper();
         mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
@@ -48,45 +43,27 @@ public class HsEntityValidator<E extends Validatable<E, T>, T extends Enum<T>> {
                 .toList();
     }
 
+    protected ArrayList<String> validateProperties(final Map<String, Object> properties) {
+        final var result = new ArrayList<String>();
+        properties.keySet().forEach( givenPropName -> {
+            if (stream(propertyValidators).map(pv -> pv.propertyName).noneMatch(propName -> propName.equals(givenPropName))) {
+                result.add(givenPropName + " is not expected but is set to '" + properties.get(givenPropName) + "'");
+            }
+        });
+        stream(propertyValidators).forEach(pv -> {
+            result.addAll(pv.validate(properties));
+        });
+        return result;
+    }
+
     @SuppressWarnings({ "unchecked", "rawtypes" })
     private static Map<String, Object> asKeyValueMap(final Map map) {
         return (Map<String, Object>) map;
     }
 
-    protected List<String> validateSubEntities(
-            final HsBookingItemEntity assetEntity,
-            final EnumSet<HsBookingItemType> subItemTypes) {
-        return properties().stream()
-                .map(prop -> validateMaxTotalValue(assetEntity, subItemTypes, prop))
-                .filter(Objects::nonNull)
-                .toList();
-    }
-
-    protected String validateMaxTotalValue(
-            final HsBookingItemEntity assetEntity,
-            final EnumSet<HsBookingItemType> subTypes,
-            final Map<String, Object> propDef) {
-        final var propName = propDef.get("propertyName").toString();
-        final var propUnit = ofNullable(propDef.get("unit")).map(u -> " " + u).orElse("");
-        final var totalValue = ofNullable(assetEntity.getSubBookingItems()).orElse(emptyList())
-                .stream()
-                .filter(subItem -> subTypes.contains(subItem.getType()))
-                .map(subItem -> toInteger(subItem.getResources().get(propName)))
-                .reduce(0, Integer::sum);
-        final var maxValue = toInteger(assetEntity.getResources().get(propName));
-        return totalValue > maxValue
-                ? "total %s is %d%s exceeds max total %s %d%s".formatted(
-                        propName, totalValue, propUnit, propName, maxValue, propUnit)
-                : null;
-    }
-
     protected List<String> validateParentEntities(final HsBookingItemEntity bookingItem) {
         return bookingItem.getParentItem() != null
-                ? HsBookingItemEntityValidators.validate(bookingItem.getParentItem())
+                ? HsBookingItemEntityValidator.doValidate(bookingItem.getParentItem())
                 : emptyList();
     }
-
-    private Integer toInteger(final Object value) {
-        return value == null ? 0 : (Integer) value;
-    }
 }

src/main/java/net/hostsharing/hsadminng/hs/validation/HsPropertyValidator.java

@@ -1,62 +0,0 @@
-package net.hostsharing.hsadminng.hs.validation;
-
-import com.fasterxml.jackson.databind.ObjectMapper;
-import lombok.RequiredArgsConstructor;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-
-@RequiredArgsConstructor
-public abstract class HsPropertyValidator<T> {
-
-    final Class<T> type;
-    final String propertyName;
-    private Boolean required;
-
-    public HsPropertyValidator<T> required() {
-        required = Boolean.TRUE;
-        return this;
-    }
-
-    public HsPropertyValidator<T> optional() {
-        required = Boolean.FALSE;
-        return this;
-    }
-
-    public final List<String> validate(final String propertiesName, final Map<String, Object> props) {
-        final var result = new ArrayList<String>();
-        final var propValue = props.get(propertyName);
-        if (propValue == null) {
-            if (required) {
-                result.add("'"+propertiesName+"." + propertyName + "' is required but missing");
-            }
-        }
-        if (propValue != null){
-            if ( type.isInstance(propValue)) {
-                //noinspection unchecked
-                validate(result, propertiesName, (T) propValue, props);
-            } else {
-                result.add("'"+propertiesName+"." + propertyName + "' is expected to be of type " + type + ", " +
-                        "but is of type '" + propValue.getClass().getSimpleName() + "'");
-            }
-        }
-        return result;
-    }
-
-    protected abstract void validate(final ArrayList<String> result, final String propertiesName, final T propValue, final Map<String, Object> props);
-
-    public void verifyConsistency(final Map.Entry<? extends Enum<?>, ?> typeDef) {
-        if (required == null ) {
-            throw new IllegalStateException(typeDef.getKey() + "[" + propertyName + "] not fully initialized, please call either .required() or .optional()" );
-        }
-    }
-
-    public Map<String, Object> toMap(final ObjectMapper mapper) {
-        final Map<String, Object> map = mapper.convertValue(this, Map.class);
-        map.put("type", simpleTypeName());
-        return map;
-    }
-
-    protected abstract String simpleTypeName();
-}

src/main/java/net/hostsharing/hsadminng/hs/validation/IntegerProperty.java

@@ -0,0 +1,46 @@
+package net.hostsharing.hsadminng.hs.validation;
+
+import lombok.Setter;
+
+import java.util.ArrayList;
+import java.util.Map;
+
+@Setter
+public class IntegerProperty extends ValidatableProperty<Integer> {
+
+    private String unit;
+    private Integer min;
+    private Integer max;
+    private Integer step;
+
+    public static IntegerProperty integerProperty(final String propertyName) {
+        return new IntegerProperty(propertyName);
+    }
+
+    private IntegerProperty(final String propertyName) {
+        super(Integer.class, propertyName);
+    }
+
+    @Override
+    public String unit() {
+        return unit;
+    }
+
+    @Override
+    protected void validate(final ArrayList<String> result, final Integer propValue, final Map<String, Object> props) {
+        if (min != null && propValue < min) {
+            result.add(propertyName + " is expected to be >= " + min + " but is " + propValue);
+        }
+        if (max != null && propValue > max) {
+            result.add(propertyName + " is expected to be <= " + max + " but is " + propValue);
+        }
+        if (step != null && propValue % step != 0) {
+            result.add(propertyName + " is expected to be multiple of " + step + " but is " + propValue);
+        }
+    }
+
+    @Override
+    protected String simpleTypeName() {
+        return "integer";
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/validation/IntegerPropertyValidator.java

@@ -1,42 +0,0 @@
-package net.hostsharing.hsadminng.hs.validation;
-
-import lombok.Setter;
-
-import java.util.ArrayList;
-import java.util.Map;
-
-@Setter
-public class IntegerPropertyValidator extends HsPropertyValidator<Integer> {
-
-    private String unit;
-    private Integer min;
-    private Integer max;
-    private Integer step;
-
-    public static IntegerPropertyValidator integerProperty(final String propertyName) {
-        return new IntegerPropertyValidator(propertyName);
-    }
-
-    private IntegerPropertyValidator(final String propertyName) {
-        super(Integer.class, propertyName);
-    }
-
-
-    @Override
-    protected void validate(final ArrayList<String> result, final String propertiesName, final Integer propValue, final Map<String, Object> props) {
-        if (min != null && propValue < min) {
-            result.add("'"+propertiesName+"." + propertyName + "' is expected to be >= " + min + " but is " + propValue);
-        }
-        if (max != null && propValue > max) {
-            result.add("'"+propertiesName+"." + propertyName + "' is expected to be <= " + max + " but is " + propValue);
-        }
-        if (step != null && propValue % step != 0) {
-            result.add("'"+propertiesName+"." + propertyName + "' is expected to be multiple of " + step + " but is " + propValue);
-        }
-    }
-
-    @Override
-    protected String simpleTypeName() {
-        return "integer";
-    }
-}

src/main/java/net/hostsharing/hsadminng/hs/validation/Validatable.java

@@ -1,13 +0,0 @@
-package net.hostsharing.hsadminng.hs.validation;
-
-
-import java.util.Map;
-
-public interface Validatable<E, T extends Enum<T>> {
-
-
-    Enum<T> getType();
-
-    String getPropertiesName();
-    Map<String, Object> getProperties();
-}

src/main/java/net/hostsharing/hsadminng/hs/validation/ValidatableProperty.java

@@ -0,0 +1,109 @@
+package net.hostsharing.hsadminng.hs.validation;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.RequiredArgsConstructor;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Supplier;
+
+import static java.lang.Boolean.FALSE;
+import static java.lang.Boolean.TRUE;
+import static java.util.Collections.emptyList;
+
+@RequiredArgsConstructor
+public abstract class ValidatableProperty<T> {
+
+    final Class<T> type;
+    final String propertyName;
+    private Boolean required;
+    private T defaultValue;
+    private Supplier<List<String>> asTotalLimitValidator;
+
+    public String unit() {
+        return null;
+    }
+
+    public ValidatableProperty<T> required() {
+        required = TRUE;
+        return this;
+    }
+
+    public ValidatableProperty<T> optional() {
+        required = FALSE;
+        return this;
+    }
+
+    public ValidatableProperty<T> withDefault(final T value) {
+        defaultValue = value;
+        required = FALSE;
+        return this;
+    }
+
+    public ValidatableProperty<T> asTotalLimit() {
+        asTotalLimitValidator = ValidatableProperty::directTotalLimitValidator;
+        return this;
+    }
+
+    public String propertyName() {
+        return propertyName;
+    }
+
+    public boolean isTotalsValidator() {
+        return asTotalLimitValidator != null;
+    }
+
+    public ValidatableProperty<T> asTotalLimitFor(final T factor, final Supplier<List<String>> validator) {
+        // FIXME: implement i
+        asTotalLimitValidator = validator; // FIXME: implement multiple
+        return this;
+    }
+
+    public final List<String> validate(final Map<String, Object> props) {
+        final var result = new ArrayList<String>();
+        final var propValue = props.get(propertyName);
+        if (propValue == null) {
+            if (required) {
+                result.add(propertyName + " is required but missing");
+            }
+        }
+        if (propValue != null){
+            if ( type.isInstance(propValue)) {
+                //noinspection unchecked
+                validate(result, (T) propValue, props);
+            } else {
+                result.add(propertyName + " is expected to be of type " + type + ", " +
+                        "but is of type '" + propValue.getClass().getSimpleName() + "'");
+            }
+        }
+        return result;
+    }
+
+    protected abstract void validate(final ArrayList<String> result, final T propValue, final Map<String, Object> props);
+
+    public void verifyConsistency(final Map.Entry<? extends Enum<?>, ?> typeDef) {
+        if (required == null ) {
+            throw new IllegalStateException(typeDef.getKey() + "[" + propertyName + "] not fully initialized, please call either .required() or .optional()" );
+        }
+    }
+
+
+    private static List<String> directTotalLimitValidator() {
+        return emptyList(); // FIXME: implement
+    }
+
+    public Map<String, Object> toMap(final ObjectMapper mapper) {
+        final Map<String, Object> map = mapper.convertValue(this, Map.class);
+        map.put("type", simpleTypeName());
+        return map;
+    }
+
+    @SuppressWarnings("unchecked")
+    public T getValue(final Map<String, Object> propValues) {
+        return (T) Optional.ofNullable(propValues.get(propertyName)).orElse(defaultValue);
+    }
+
+    protected abstract String simpleTypeName();
+}

src/test/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsBookingItemEntityValidatorUnitTest.java

@@ -1,6 +1,8 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
+import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectEntity;
 import org.junit.jupiter.api.Test;
 
 import jakarta.validation.ValidationException;
@@ -9,17 +11,26 @@ import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.PRIVAT
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_WEBSPACE;
-import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators.valid;
+import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator.valid;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.catchThrowable;
 
-class HsBookingItemEntityValidatorsUnitTest {
+class HsBookingItemEntityValidatorUnitTest {
+    final HsBookingDebitorEntity debitor = HsBookingDebitorEntity.builder()
+            .debitorNumber(12345)
+            .build();
+    final HsBookingProjectEntity project = HsBookingProjectEntity.builder()
+            .debitor(debitor)
+            .caption("test project")
+            .build();
 
     @Test
     void validThrowsException() {
         // given
         final var cloudServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(CLOUD_SERVER)
+                .project(project)
+                .caption("Test-Server")
                 .build();
 
         // when
@@ -28,16 +39,16 @@ class HsBookingItemEntityValidatorsUnitTest {
         // then
         assertThat(result).isInstanceOf(ValidationException.class)
                 .hasMessageContaining(
-                        "'resources.CPUs' is required but missing",
+                        "D-12345:test project:Test-Server.resources.CPUs is required but missing",
-                        "'resources.RAM' is required but missing",
+                        "D-12345:test project:Test-Server.resources.RAM is required but missing",
-                        "'resources.SSD' is required but missing",
+                        "D-12345:test project:Test-Server.resources.SSD is required but missing",
-                        "'resources.Traffic' is required but missing");
+                        "D-12345:test project:Test-Server.resources.Traffic is required but missing");
     }
 
     @Test
     void listsTypes() {
         // when
-        final var result = HsBookingItemEntityValidators.types();
+        final var result = HsBookingItemEntityValidator.types();
 
         // then
         assertThat(result).containsExactlyInAnyOrder(PRIVATE_CLOUD, CLOUD_SERVER, MANAGED_SERVER, MANAGED_WEBSPACE);

src/test/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsCloudServerBookingItemValidatorUnitTest.java

@@ -1,6 +1,8 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
+import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectEntity;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
@@ -11,16 +13,26 @@ import static java.util.Map.ofEntries;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.PRIVATE_CLOUD;
-import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators.forType;
+import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator.forType;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class HsCloudServerBookingItemValidatorUnitTest {
 
+    final HsBookingDebitorEntity debitor = HsBookingDebitorEntity.builder()
+            .debitorNumber(12345)
+            .build();
+    final HsBookingProjectEntity project = HsBookingProjectEntity.builder()
+            .debitor(debitor)
+            .caption("Test-Project")
+            .build();
+
     @Test
     void validatesProperties() {
         // given
         final var cloudServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(CLOUD_SERVER)
+                .project(project)
+                .caption("Test-Server")
                 .resources(Map.ofEntries(
                         entry("CPUs", 2),
                         entry("RAM", 25),
@@ -31,10 +43,10 @@ class HsCloudServerBookingItemValidatorUnitTest {
                 .build();
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(cloudServerBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(cloudServerBookingItemEntity);
 
         // then
-        assertThat(result).containsExactly("'resources.SLA-EMail' is not expected but is set to 'true'");
+        assertThat(result).containsExactly("D-12345:Test-Project:Test-Server.resources.SLA-EMail is not expected but is set to 'true'");
     }
 
     @Test
@@ -44,12 +56,12 @@ class HsCloudServerBookingItemValidatorUnitTest {
 
         // then
         assertThat(validator.properties()).map(Map::toString).containsExactlyInAnyOrder(
-                "{type=integer, propertyName=CPUs, required=true, unit=null, min=1, max=32, step=null}",
+                "{type=integer, propertyName=CPUs, required=true, defaultValue=null, asTotalLimitValidator=null, unit=null, min=1, max=32, step=null, totalsValidator=false}",
-                "{type=integer, propertyName=RAM, required=true, unit=GB, min=1, max=128, step=null}",
+                "{type=integer, propertyName=RAM, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=1, max=128, step=null, totalsValidator=false}",
-                "{type=integer, propertyName=SSD, required=true, unit=GB, min=25, max=1000, step=25}",
+                "{type=integer, propertyName=SSD, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=25, max=1000, step=25, totalsValidator=false}",
-                "{type=integer, propertyName=HDD, required=false, unit=GB, min=0, max=4000, step=250}",
+                "{type=integer, propertyName=HDD, required=false, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=0, max=4000, step=250, totalsValidator=false}",
-                "{type=integer, propertyName=Traffic, required=true, unit=GB, min=250, max=10000, step=250}",
+                "{type=integer, propertyName=Traffic, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=250, max=10000, step=250, totalsValidator=false}",
-                "{type=enumeration, propertyName=SLA-Infrastructure, required=false, values=[BASIC, EXT8H, EXT4H, EXT2H]}");
+                "{type=enumeration, propertyName=SLA-Infrastructure, required=false, defaultValue=null, asTotalLimitValidator=null, values=[BASIC, EXT8H, EXT4H, EXT2H], totalsValidator=false}");
     }
 
     @Test
@@ -57,6 +69,7 @@ class HsCloudServerBookingItemValidatorUnitTest {
         // given
         final var subCloudServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(CLOUD_SERVER)
+                .caption("Test Cloud-Server")
                 .resources(ofEntries(
                         entry("CPUs", 2),
                         entry("RAM", 10),
@@ -66,6 +79,7 @@ class HsCloudServerBookingItemValidatorUnitTest {
                 .build();
         final HsBookingItemEntity subManagedServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(MANAGED_SERVER)
+                .caption("Test Managed-Server")
                 .resources(ofEntries(
                         entry("CPUs", 3),
                         entry("RAM", 20),
@@ -75,6 +89,8 @@ class HsCloudServerBookingItemValidatorUnitTest {
                 .build();
         final var privateCloudBookingItemEntity = HsBookingItemEntity.builder()
                 .type(PRIVATE_CLOUD)
+                .project(project)
+                .caption("Test Cloud")
                 .resources(ofEntries(
                         entry("CPUs", 4),
                         entry("RAM", 20),
@@ -90,14 +106,14 @@ class HsCloudServerBookingItemValidatorUnitTest {
         subCloudServerBookingItemEntity.setParentItem(privateCloudBookingItemEntity);
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(subCloudServerBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(subCloudServerBookingItemEntity);
 
         // then
         assertThat(result).containsExactlyInAnyOrder(
-                "total CPUs is 5 exceeds max total CPUs 4",
+                "D-12345:Test-Project:Test Cloud-Server.parentItem.total CPUs is 5 exceeds max total CPUs 4",
-                "total RAM is 30 GB exceeds max total RAM 20 GB",
+                "D-12345:Test-Project:Test Cloud-Server.parentItem.total RAM is 30 GB exceeds max total RAM 20 GB",
-                "total SSD is 150 GB exceeds max total SSD 100 GB",
+                "D-12345:Test-Project:Test Cloud-Server.parentItem.total SSD is 150 GB exceeds max total SSD 100 GB",
-                "total Traffic is 5500 GB exceeds max total Traffic 5000 GB"
+                "D-12345:Test-Project:Test Cloud-Server.parentItem.total Traffic is 5500 GB exceeds max total Traffic 5000 GB"
         );
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsManagedServerBookingItemValidatorUnitTest.java

@@ -1,6 +1,8 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
+import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectEntity;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
@@ -11,16 +13,25 @@ import static java.util.Map.ofEntries;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.CLOUD_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_SERVER;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.PRIVATE_CLOUD;
-import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidators.forType;
+import static net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidator.forType;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class HsManagedServerBookingItemValidatorUnitTest {
 
+    final HsBookingDebitorEntity debitor = HsBookingDebitorEntity.builder()
+            .debitorNumber(12345)
+            .build();
+    final HsBookingProjectEntity project = HsBookingProjectEntity.builder()
+            .debitor(debitor)
+            .caption("Test-Project")
+            .build();
+
     @Test
     void validatesProperties() {
         // given
         final var mangedServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(MANAGED_SERVER)
+                .project(project)
                 .resources(Map.ofEntries(
                         entry("CPUs", 2),
                         entry("RAM", 25),
@@ -31,10 +42,10 @@ class HsManagedServerBookingItemValidatorUnitTest {
                 .build();
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(mangedServerBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(mangedServerBookingItemEntity);
 
         // then
-        assertThat(result).containsExactly("'resources.SLA-EMail' is expected to be false because resources.SLA-Platform=BASIC but is true");
+        assertThat(result).containsExactly("D-12345:Test-Project:null.resources.SLA-EMail is expected to be false because SLA-Platform=BASIC but is true");
     }
 
     @Test
@@ -44,17 +55,17 @@ class HsManagedServerBookingItemValidatorUnitTest {
 
         // then
         assertThat(validator.properties()).map(Map::toString).containsExactlyInAnyOrder(
-                "{type=integer, propertyName=CPUs, required=true, unit=null, min=1, max=32, step=null}",
+                "{type=integer, propertyName=CPUs, required=true, defaultValue=null, asTotalLimitValidator=null, unit=null, min=1, max=32, step=null, totalsValidator=false}",
-                "{type=integer, propertyName=RAM, required=true, unit=GB, min=1, max=128, step=null}",
+                "{type=integer, propertyName=RAM, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=1, max=128, step=null, totalsValidator=false}",
-                "{type=integer, propertyName=SSD, required=true, unit=GB, min=25, max=1000, step=25}",
+                "{type=integer, propertyName=SSD, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=25, max=1000, step=25, totalsValidator=false}",
-                "{type=integer, propertyName=HDD, required=false, unit=GB, min=0, max=4000, step=250}",
+                "{type=integer, propertyName=HDD, required=false, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=0, max=4000, step=250, totalsValidator=false}",
-                "{type=integer, propertyName=Traffic, required=true, unit=GB, min=250, max=10000, step=250}",
+                "{type=integer, propertyName=Traffic, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=250, max=10000, step=250, totalsValidator=false}",
-                "{type=enumeration, propertyName=SLA-Platform, required=false, values=[BASIC, EXT8H, EXT4H, EXT2H]}",
+                "{type=enumeration, propertyName=SLA-Platform, required=false, defaultValue=null, asTotalLimitValidator=null, values=[BASIC, EXT8H, EXT4H, EXT2H], totalsValidator=false}",
-                "{type=boolean, propertyName=SLA-EMail, required=false, falseIf={SLA-Platform=BASIC}}",
+                "{type=boolean, propertyName=SLA-EMail, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf={SLA-Platform=BASIC}, totalsValidator=false}",
-                "{type=boolean, propertyName=SLA-Maria, required=false, falseIf={SLA-Platform=BASIC}}",
+                "{type=boolean, propertyName=SLA-Maria, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf={SLA-Platform=BASIC}, totalsValidator=false}",
-                "{type=boolean, propertyName=SLA-PgSQL, required=false, falseIf={SLA-Platform=BASIC}}",
+                "{type=boolean, propertyName=SLA-PgSQL, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf={SLA-Platform=BASIC}, totalsValidator=false}",
-                "{type=boolean, propertyName=SLA-Office, required=false, falseIf={SLA-Platform=BASIC}}",
+                "{type=boolean, propertyName=SLA-Office, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf={SLA-Platform=BASIC}, totalsValidator=false}",
-                "{type=boolean, propertyName=SLA-Web, required=false, falseIf={SLA-Platform=BASIC}}");
+                "{type=boolean, propertyName=SLA-Web, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf={SLA-Platform=BASIC}, totalsValidator=false}");
     }
 
     @Test
@@ -80,6 +91,7 @@ class HsManagedServerBookingItemValidatorUnitTest {
                 .build();
         final var privateCloudBookingItemEntity = HsBookingItemEntity.builder()
                 .type(PRIVATE_CLOUD)
+                .project(project)
                 .resources(ofEntries(
                         entry("CPUs", 4),
                         entry("RAM", 20),
@@ -91,18 +103,19 @@ class HsManagedServerBookingItemValidatorUnitTest {
                         subCloudServerBookingItemEntity
                 ))
                 .build();
+
         subManagedServerBookingItemEntity.setParentItem(privateCloudBookingItemEntity);
         subCloudServerBookingItemEntity.setParentItem(privateCloudBookingItemEntity);
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(subManagedServerBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(subManagedServerBookingItemEntity);
 
         // then
         assertThat(result).containsExactlyInAnyOrder(
-                "total CPUs is 5 exceeds max total CPUs 4",
+                "D-12345:Test-Project:null.parentItem.total CPUs is 5 exceeds max total CPUs 4",
-                "total RAM is 30 GB exceeds max total RAM 20 GB",
+                "D-12345:Test-Project:null.parentItem.total RAM is 30 GB exceeds max total RAM 20 GB",
-                "total SSD is 150 GB exceeds max total SSD 100 GB",
+                "D-12345:Test-Project:null.parentItem.total SSD is 150 GB exceeds max total SSD 100 GB",
-                "total Traffic is 5500 GB exceeds max total Traffic 5000 GB"
+                "D-12345:Test-Project:null.parentItem.total Traffic is 5500 GB exceeds max total Traffic 5000 GB"
         );
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsManagedWebspaceBookingItemValidatorUnitTest.java

@@ -1,6 +1,8 @@
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
+import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectEntity;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
@@ -11,11 +13,21 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 class HsManagedWebspaceBookingItemValidatorUnitTest {
 
+    final HsBookingDebitorEntity debitor = HsBookingDebitorEntity.builder()
+            .debitorNumber(12345)
+            .build();
+    final HsBookingProjectEntity project = HsBookingProjectEntity.builder()
+            .debitor(debitor)
+            .caption("Test-Project")
+            .build();
+
     @Test
     void validatesProperties() {
         // given
         final var mangedServerBookingItemEntity = HsBookingItemEntity.builder()
                 .type(MANAGED_WEBSPACE)
+                .project(project)
+                .caption("Test Managed-Webspace")
                 .resources(Map.ofEntries(
                         entry("CPUs", 2),
                         entry("RAM", 25),
@@ -26,27 +38,29 @@ class HsManagedWebspaceBookingItemValidatorUnitTest {
                 .build();
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(mangedServerBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(mangedServerBookingItemEntity);
 
         // then
         assertThat(result).containsExactlyInAnyOrder(
-                "'resources.CPUs' is not expected but is set to '2'",
+                "D-12345:Test-Project:Test Managed-Webspace.resources.SLA-EMail is not expected but is set to 'true'",
-                "'resources.SLA-EMail' is not expected but is set to 'true'",
+                "D-12345:Test-Project:Test Managed-Webspace.resources.CPUs is not expected but is set to '2'",
-                "'resources.RAM' is not expected but is set to '25'");
+                "D-12345:Test-Project:Test Managed-Webspace.resources.RAM is not expected but is set to '25'",
+                "D-12345:Test-Project:Test Managed-Webspace.resources.MultiOptions is required but missing");
     }
 
     @Test
     void containsAllValidations() {
         // when
-        final var validator = HsBookingItemEntityValidators.forType(MANAGED_WEBSPACE);
+        final var validator = HsBookingItemEntityValidator.forType(MANAGED_WEBSPACE);
 
         // then
         assertThat(validator.properties()).map(Map::toString).containsExactlyInAnyOrder(
-            "{type=integer, propertyName=SSD, required=true, unit=GB, min=1, max=100, step=1}",
+                "{type=integer, propertyName=SSD, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=1, max=100, step=1, totalsValidator=false}",
-            "{type=integer, propertyName=HDD, required=false, unit=GB, min=0, max=250, step=10}",
+                "{type=integer, propertyName=HDD, required=false, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=0, max=250, step=10, totalsValidator=false}",
-            "{type=integer, propertyName=Traffic, required=true, unit=GB, min=10, max=1000, step=10}",
+                "{type=integer, propertyName=Traffic, required=true, defaultValue=null, asTotalLimitValidator=null, unit=GB, min=10, max=1000, step=10, totalsValidator=false}",
-            "{type=enumeration, propertyName=SLA-Platform, required=false, values=[BASIC, EXT24H]}",
+                "{type=integer, propertyName=MultiOptions, required=true, defaultValue=null, asTotalLimitValidator={}, unit=null, min=1, max=100, step=1, totalsValidator=true}",
-            "{type=integer, propertyName=Daemons, required=false, unit=null, min=0, max=10, step=null}",
+                "{type=integer, propertyName=Daemons, required=false, defaultValue=null, asTotalLimitValidator=null, unit=null, min=0, max=10, step=null, totalsValidator=false}",
-            "{type=boolean, propertyName=Online Office Server, required=false, falseIf=null}");
+                "{type=boolean, propertyName=Online Office Server, required=false, defaultValue=null, asTotalLimitValidator=null, falseIf=null, totalsValidator=false}",
+                "{type=enumeration, propertyName=SLA-Platform, required=false, defaultValue=null, asTotalLimitValidator=null, values=[BASIC, EXT24H], totalsValidator=false}");
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsPrivateCloudBookingItemValidatorTest.java

@@ -48,7 +48,7 @@ class HsPrivateCloudBookingItemValidatorTest {
                 .build();
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(privateCloudBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(privateCloudBookingItemEntity);
 
         // then
         assertThat(result).isEmpty();
@@ -88,7 +88,7 @@ class HsPrivateCloudBookingItemValidatorTest {
                 .build();
 
         // when
-        final var result = HsBookingItemEntityValidators.validate(privateCloudBookingItemEntity);
+        final var result = HsBookingItemEntityValidator.doValidate(privateCloudBookingItemEntity);
 
         // then
         assertThat(result).containsExactlyInAnyOrder(

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsManagedWebspaceHostingAssetValidatorUnitTest.java

@@ -1,13 +1,14 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validators;
 
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
+import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 import org.junit.jupiter.api.Test;
 
 import java.util.Map;
 
 import static java.util.Map.entry;
-import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MANAGED_SERVER;
 import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.MANAGED_WEBSPACE;
 import static org.assertj.core.api.Assertions.assertThat;
 import static net.hostsharing.hsadminng.hs.booking.project.TestHsBookingProject.TEST_PROJECT;
@@ -16,14 +17,15 @@ class HsManagedWebspaceHostingAssetValidatorUnitTest {
 
     final HsBookingItemEntity managedServerBookingItem = HsBookingItemEntity.builder()
             .project(TEST_PROJECT)
+            .type(HsBookingItemType.MANAGED_SERVER)
             .build();
     final HsHostingAssetEntity mangedServerAssetEntity = HsHostingAssetEntity.builder()
-            .type(MANAGED_SERVER)
+            .type(HsHostingAssetType.MANAGED_SERVER)
             .bookingItem(managedServerBookingItem)
             .config(Map.ofEntries(
-                    entry("HDD", 0),
+                    entry("monit_max_ssd_usage", 70),
-                    entry("SSD", 1),
+                    entry("monit_max_cpu_usage", 80),
-                    entry("Traffic", 10)
+                    entry("monit_max_ram_usage", 90)
             ))
             .build();