src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionController.java

@@ -27,11 +27,13 @@ import java.util.UUID;
 import java.util.function.BiConsumer;
 
 import static java.util.Optional.ofNullable;
+import static net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionType.REVERSAL;
+import static net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionType.TRANSFER;
 import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionTypeResource.CLEARING;
 import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionTypeResource.DEPOSIT;
 import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionTypeResource.DISBURSAL;
 import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionTypeResource.LOSS;
-import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionTypeResource.TRANSFER;
+import static net.hostsharing.hsadminng.lambda.WithNonNull.withNonNull;
 
 @RestController
 public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAssetsApi {
@@ -66,7 +68,10 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
                 fromValueDate,
                 toValueDate);
 
-        final var resources = mapper.mapList(entities, HsOfficeCoopAssetsTransactionResource.class, ENTITY_TO_RESOURCE_POSTMAPPER);
+        final var resources = mapper.mapList(
+                entities,
+                HsOfficeCoopAssetsTransactionResource.class,
+                ENTITY_TO_RESOURCE_POSTMAPPER);
         return ResponseEntity.ok(resources);
     }
 
@@ -106,7 +111,11 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
         if (result.isEmpty()) {
             return ResponseEntity.notFound().build();
         }
-        return ResponseEntity.ok(mapper.map(result.get(), HsOfficeCoopAssetsTransactionResource.class));
+        final var resource = mapper.map(
+                result.get(),
+                HsOfficeCoopAssetsTransactionResource.class,
+                ENTITY_TO_RESOURCE_POSTMAPPER);
+        return ResponseEntity.ok(resource);
 
     }
 
@@ -131,7 +140,8 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
     private static void validateCreditTransaction(
             final HsOfficeCoopAssetsTransactionInsertResource requestBody,
             final ArrayList<String> violations) {
-        if (List.of(DISBURSAL, TRANSFER, CLEARING, LOSS).contains(requestBody.getTransactionType())
+        if (List.of(DISBURSAL, HsOfficeCoopAssetsTransactionTypeResource.TRANSFER, CLEARING, LOSS)
+                .contains(requestBody.getTransactionType())
                 && requestBody.getAssetValue().signum() > 0) {
             violations.add("for %s, assetValue must be negative but is \"%.2f\"".formatted(
                     requestBody.getTransactionType(), requestBody.getAssetValue()));
@@ -151,53 +161,102 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
         resource.setMembershipUuid(entity.getMembership().getUuid());
         resource.setMembershipMemberNumber(entity.getMembership().getTaggedMemberNumber());
 
-        if (entity.getReversalAssetTx() != null) {
+        withNonNull(
-            resource.getReversalAssetTx().setRevertedAssetTxUuid(entity.getUuid());
+                resource.getReversalAssetTx(), reversalAssetTxResource -> {
-            resource.getReversalAssetTx().setMembershipUuid(entity.getMembership().getUuid());
+                    reversalAssetTxResource.setMembershipUuid(entity.getMembership().getUuid());
-            resource.getReversalAssetTx().setMembershipMemberNumber(entity.getTaggedMemberNumber());
+                    reversalAssetTxResource.setMembershipMemberNumber(entity.getTaggedMemberNumber());
-        }
+                    reversalAssetTxResource.setRevertedAssetTxUuid(entity.getUuid());
+                    withNonNull(
+                            entity.getAdoptionAssetTx(), adoptionAssetTx ->
+                                    reversalAssetTxResource.setAdoptionAssetTxUuid(adoptionAssetTx.getUuid()));
+                    withNonNull(
+                            entity.getTransferAssetTx(), transferAssetTxResource ->
+                                    reversalAssetTxResource.setTransferAssetTxUuid(transferAssetTxResource.getUuid()));
+                });
 
-        if (entity.getRevertedAssetTx() != null) {
+        withNonNull(
-            resource.getRevertedAssetTx().setReversalAssetTxUuid(entity.getUuid());
+                resource.getRevertedAssetTx(), revertAssetTxResource -> {
-            resource.getRevertedAssetTx().setMembershipUuid(entity.getMembership().getUuid());
+                    revertAssetTxResource.setMembershipUuid(entity.getMembership().getUuid());
-            resource.getRevertedAssetTx().setMembershipMemberNumber(entity.getTaggedMemberNumber());
+                    revertAssetTxResource.setMembershipMemberNumber(entity.getTaggedMemberNumber());
-        }
+                    revertAssetTxResource.setReversalAssetTxUuid(entity.getUuid());
+                    withNonNull(
+                            entity.getRevertedAssetTx().getAdoptionAssetTx(), adoptionAssetTx ->
+                                    revertAssetTxResource.setAdoptionAssetTxUuid(adoptionAssetTx.getUuid()));
+                    withNonNull(
+                            entity.getRevertedAssetTx().getTransferAssetTx(), transferAssetTxResource ->
+                                    revertAssetTxResource.setTransferAssetTxUuid(transferAssetTxResource.getUuid()));
+                });
 
-        if (entity.getAdoptionAssetTx() != null) {
+        withNonNull(
-            resource.getAdoptionAssetTx().setTransferAssetTxUuid(entity.getUuid());
+                resource.getAdoptionAssetTx(), adoptionAssetTxResource -> {
-            resource.getAdoptionAssetTx().setMembershipUuid(entity.getAdoptionAssetTx().getMembership().getUuid());
+                    adoptionAssetTxResource.setMembershipUuid(entity.getAdoptionAssetTx().getMembership().getUuid());
-            resource.getAdoptionAssetTx().setMembershipMemberNumber(entity.getAdoptionAssetTx().getTaggedMemberNumber());
+                    adoptionAssetTxResource.setMembershipMemberNumber(entity.getAdoptionAssetTx().getTaggedMemberNumber());
-        }
+                    adoptionAssetTxResource.setTransferAssetTxUuid(entity.getUuid());
+                    withNonNull(
+                            entity.getAdoptionAssetTx().getReversalAssetTx(), reversalAssetTx ->
+                                    adoptionAssetTxResource.setReversalAssetTxUuid(reversalAssetTx.getUuid()));
+                });
 
-        if (entity.getTransferAssetTx() != null) {
+        withNonNull(
-            resource.getTransferAssetTx().setAdoptionAssetTxUuid(entity.getUuid());
+                resource.getTransferAssetTx(), transferAssetTxResource -> {
                     resource.getTransferAssetTx().setMembershipUuid(entity.getTransferAssetTx().getMembership().getUuid());
-            resource.getTransferAssetTx().setMembershipMemberNumber(entity.getTransferAssetTx().getTaggedMemberNumber());
+                    resource.getTransferAssetTx()
-        }
+                            .setMembershipMemberNumber(entity.getTransferAssetTx().getTaggedMemberNumber());
+                    resource.getTransferAssetTx().setAdoptionAssetTxUuid(entity.getUuid());
+                    withNonNull(
+                            entity.getTransferAssetTx().getReversalAssetTx(), reversalAssetTx ->
+                                    transferAssetTxResource.setReversalAssetTxUuid(reversalAssetTx.getUuid()));
+                });
     };
 
     final BiConsumer<HsOfficeCoopAssetsTransactionInsertResource, HsOfficeCoopAssetsTransactionEntity> RESOURCE_TO_ENTITY_POSTMAPPER = (resource, entity) -> {
 
         if (resource.getMembershipUuid() != null) {
-            final HsOfficeMembershipEntity membership = ofNullable(emw.find(HsOfficeMembershipEntity.class, resource.getMembershipUuid()))
+            final HsOfficeMembershipEntity membership = ofNullable(emw.find(
+                    HsOfficeMembershipEntity.class,
+                    resource.getMembershipUuid()))
                     .orElseThrow(() -> new EntityNotFoundException("ERROR: [400] membership.uuid %s not found".formatted(
                             resource.getMembershipUuid())));
             entity.setMembership(membership);
         }
-        if (resource.getRevertedAssetTxUuid() != null) {
+
+        if (entity.getTransactionType() == REVERSAL) {
+            if (resource.getRevertedAssetTxUuid() == null) {
+                throw new ValidationException("REVERSAL asset transaction requires revertedAssetTx.uuid");
+            }
             final var revertedAssetTx = coopAssetsTransactionRepo.findByUuid(resource.getRevertedAssetTxUuid())
                     .orElseThrow(() -> new EntityNotFoundException("ERROR: [400] revertedEntityUuid %s not found".formatted(
                             resource.getRevertedAssetTxUuid())));
+            revertedAssetTx.setReversalAssetTx(entity);
             entity.setRevertedAssetTx(revertedAssetTx);
             if (resource.getAssetValue().negate().compareTo(revertedAssetTx.getAssetValue()) != 0) {
                 throw new ValidationException("given assetValue=" + resource.getAssetValue() +
                         " but must be negative value from reverted asset tx: " + revertedAssetTx.getAssetValue());
             }
+
+            if (revertedAssetTx.getTransactionType() == TRANSFER) {
+                final var adoptionAssetTx = revertedAssetTx.getAdoptionAssetTx();
+                final var adoptionReversalAssetTx = HsOfficeCoopAssetsTransactionEntity.builder()
+                        .transactionType(REVERSAL)
+                        .membership(adoptionAssetTx.getMembership()) // FIXME: check
+                        .revertedAssetTx(adoptionAssetTx)
+                        .assetValue(adoptionAssetTx.getAssetValue().negate())
+                        .comment(resource.getComment())
+                        .reference(resource.getReference())
+                        .valueDate(resource.getValueDate())
+                        .build();
+                adoptionAssetTx.setReversalAssetTx(adoptionReversalAssetTx);
+                adoptionReversalAssetTx.setRevertedAssetTx(adoptionAssetTx);
+            }
         }
 
+        if (resource.getTransactionType() == HsOfficeCoopAssetsTransactionTypeResource.TRANSFER) {
             final var adoptingMembership = determineAdoptingMembership(resource);
-        if (adoptingMembership != null) {
+            if (adoptingMembership == null) {
-            final var adoptingAssetTx = coopAssetsTransactionRepo.save(createAdoptingAssetTx(entity, adoptingMembership));
+                throw new ValidationException(
+                        "TRANSFER asset transaction requires adoptingMembership.uuid or adoptingMembership.memberNumber");
+            }
+            final var adoptingAssetTx = createAdoptingAssetTx(entity, adoptingMembership);
             entity.setAdoptionAssetTx(adoptingAssetTx);
         }
     };
@@ -208,7 +267,7 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
         if (adoptingMembershipUuid != null && adoptingMembershipMemberNumber != null) {
             throw new IllegalArgumentException(
                     // @formatter:off
-                resource.getTransactionType() == TRANSFER
+                resource.getTransactionType() == HsOfficeCoopAssetsTransactionTypeResource.TRANSFER
                     ? "[400] either adoptingMembership.uuid or adoptingMembership.memberNumber can be given, not both"
                     : "[400] adoptingMembership.uuid and adoptingMembership.memberNumber must not be given for transactionType="
                             + resource.getTransactionType());
@@ -232,10 +291,10 @@ public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAsse
                     + "' not found or not accessible");
         }
 
-        if (resource.getTransactionType() == TRANSFER) {
+        if (resource.getTransactionType() == HsOfficeCoopAssetsTransactionTypeResource.TRANSFER) {
             throw new ValidationException(
                     "either adoptingMembership.uuid or adoptingMembership.memberNumber must be given for transactionType="
-                            + TRANSFER);
+                            + HsOfficeCoopAssetsTransactionTypeResource.TRANSFER);
         }
 
         return null;

src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionEntity.java

@@ -98,21 +98,21 @@ public class HsOfficeCoopAssetsTransactionEntity implements Stringifyable, BaseE
     private String comment;
 
     // Optionally, the UUID of the corresponding transaction for a reversal transaction.
-    @OneToOne(cascade = CascadeType.PERSIST) // TODO.impl: can probably be removed after office data migration
+    @OneToOne
     @JoinColumn(name = "revertedassettxuuid")
     private HsOfficeCoopAssetsTransactionEntity revertedAssetTx;
 
     // and the other way around
-    @OneToOne(mappedBy = "revertedAssetTx")
+    @OneToOne(mappedBy = "revertedAssetTx", cascade = CascadeType.PERSIST)
     private HsOfficeCoopAssetsTransactionEntity reversalAssetTx;
 
     // Optionally, the UUID of the corresponding transaction for a transfer transaction.
-    @OneToOne(cascade = CascadeType.PERSIST) // TODO.impl: can probably be removed after office data migration
+    @OneToOne(cascade = CascadeType.PERSIST)
     @JoinColumn(name = "assetadoptiontxuuid")
     private HsOfficeCoopAssetsTransactionEntity adoptionAssetTx;
 
     // and the other way around
-    @OneToOne(mappedBy = "adoptionAssetTx")
+    @OneToOne(mappedBy = "adoptionAssetTx", cascade = CascadeType.PERSIST)
     private HsOfficeCoopAssetsTransactionEntity transferAssetTx;
 
     @Override

src/main/java/net/hostsharing/hsadminng/lambda/WithNonNull.java

@@ -0,0 +1,11 @@
+package net.hostsharing.hsadminng.lambda;
+
+import java.util.function.Consumer;
+
+public class WithNonNull {
+        public static <T> void withNonNull(final T target, final Consumer<T> code) {
+            if (target != null ) {
+                code.accept(target);
+            }
+    }
+}

src/main/resources/db/changelog/5-hs-office/512-coopassets/5120-hs-office-coopassets.sql

@@ -35,21 +35,41 @@ create table if not exists hs_office.coopassettx
 --changeset michael.hoennig:hs-office-coopassets-BUSINESS-RULES endDelimiter:--//
 -- ----------------------------------------------------------------------------
 
-alter table hs_office.coopassettx
+-- Not as CHECK constraints because those cannot be deferrable,
-    add constraint reversal_asset_tx_must_have_reverted_asset_tx
+-- but we need these constraints deferrable because the rows are linked to each other.
-        check (transactionType <> 'REVERSAL' or revertedAssetTxUuid is not null);
 
-alter table hs_office.coopassettx
+CREATE OR REPLACE FUNCTION validate_transaction_type()
-    add constraint non_reversal_asset_tx_must_not_have_reverted_asset_tx
+    RETURNS TRIGGER AS $$
-        check (transactionType = 'REVERSAL' or revertedAssetTxUuid is null or transactionType = 'REVERSAL');
+BEGIN
+    -- REVERSAL transactions must have revertedAssetTxUuid
+    IF NEW.transactionType = 'REVERSAL' AND NEW.revertedAssetTxUuid IS NULL THEN
+        RAISE EXCEPTION 'REVERSAL transactions must have revertedAssetTxUuid';
+    END IF;
 
-alter table hs_office.coopassettx
+    -- Non-REVERSAL transactions must not have revertedAssetTxUuid
-    add constraint transfer_asset_tx_must_have_adopted_asset_tx
+    IF NEW.transactionType != 'REVERSAL' AND NEW.revertedAssetTxUuid IS NOT NULL THEN
-        check (transactionType <> 'TRANSFER' or assetAdoptionTxUuid is not null);
+        RAISE EXCEPTION 'Non-REVERSAL transactions must not have revertedAssetTxUuid';
+    END IF;
+
+    -- TRANSFER transactions must have assetAdoptionTxUuid
+    IF NEW.transactionType = 'TRANSFER' AND NEW.assetAdoptionTxUuid IS NULL THEN
+        RAISE EXCEPTION 'TRANSFER transactions must have assetAdoptionTxUuid';
+    END IF;
+
+    -- Non-TRANSFER transactions must not have assetAdoptionTxUuid
+    IF NEW.transactionType != 'TRANSFER' AND NEW.assetAdoptionTxUuid IS NOT NULL THEN
+        RAISE EXCEPTION 'Non-TRANSFER transactions must not have assetAdoptionTxUuid';
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Attach the trigger to the table
+CREATE TRIGGER enforce_transaction_constraints
+    AFTER INSERT OR UPDATE ON hs_office.coopassettx
+    FOR EACH ROW EXECUTE FUNCTION validate_transaction_type();
 
-alter table hs_office.coopassettx
-    add constraint non_transfer_asset_tx_must_not_have_adopted_asset_tx
-        check (transactionType = 'TRANSFER' or assetAdoptionTxUuid is null);
 --//
 
 -- ============================================================================

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/HsOfficeScenarioTests.java

@@ -16,7 +16,8 @@ import net.hostsharing.hsadminng.hs.office.scenarios.membership.CancelMembership
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.CreateMembership;
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsDepositTransaction;
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsDisbursalTransaction;
-import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsRevertTransaction;
+import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsRevertSimpleTransaction;
+import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsRevertTransferTransaction;
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets.CreateCoopAssetsTransferTransaction;
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopshares.CreateCoopSharesCancellationTransaction;
 import net.hostsharing.hsadminng.hs.office.scenarios.membership.coopshares.CreateCoopSharesRevertTransaction;
@@ -30,7 +31,6 @@ import net.hostsharing.hsadminng.hs.office.scenarios.subscription.RemoveOperatio
 import net.hostsharing.hsadminng.hs.office.scenarios.subscription.SubscribeToMailinglist;
 import net.hostsharing.hsadminng.hs.office.scenarios.subscription.UnsubscribeFromMailinglist;
 import net.hostsharing.hsadminng.rbac.test.JpaAttempt;
-import net.hostsharing.hsadminng.test.IgnoreOnFailure;
 import net.hostsharing.hsadminng.test.IgnoreOnFailureExtension;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.MethodOrderer;
@@ -395,7 +395,7 @@ class HsOfficeScenarioTests extends ScenarioTest {
     @Order(4302)
     @Requires("Membership: M-3101000 - Test AG")
     void shouldRevertCoopAssetsSubscription() {
-        new CreateCoopAssetsRevertTransaction(this)
+        new CreateCoopAssetsRevertSimpleTransaction(this)
                 .given("memberNumber", "M-3101000")
                 .given("comment", "reverting some incorrect transaction")
                 .given("dateOfIncorrectTransaction", "2024-02-15")
@@ -419,13 +419,13 @@ class HsOfficeScenarioTests extends ScenarioTest {
     @Test
     @Order(4304)
     @Requires("Coop-Assets M-3101000 - Test AG - DEPOSIT Transaction")
-    @Produces("Coop-Assets M-3101000 - Test AG - TRANSFER Transaction")
+    @Produces(explicitly = "Coop-Assets M-3101000 - Test AG - TRANSFER Transaction", implicitly = "Membership M-4303000")
     void shouldTransferCoopAssets() {
         new CreateCoopAssetsTransferTransaction(this)
                 .given("transferringMemberNumber", "M-3101000")
                 .given("adoptingMemberNumber", "M-4303000")
                 .given("reference", "transfer 2024-12-31")
-                .given("valueToDisburse", 2 * 64)
+                .given("valueToTransfer", 2 * 64)
                 .given("comment", "transfer assets from M-3101000 to M-4303000")
                 .given("transactionDate", "2024-12-31")
                 .doRun();
@@ -433,11 +433,12 @@ class HsOfficeScenarioTests extends ScenarioTest {
 
     @Test
     @Order(4305)
-    @Requires("Coop-Assets M-3101000 - Test AG - TRANSFER Transaction")
+    @Requires("Membership M-4303000")
-    @IgnoreOnFailure("TODO.impl: reverting transfers is not implemented yet")
+    void shouldRevertCoopAssetsTransferIncludingRelatedAssetAdoption() {
-    void shouldRevertCoopAssetsTransfer() {
+        new CreateCoopAssetsRevertTransferTransaction(this)
-        new CreateCoopAssetsRevertTransaction(this)
+                .given("transferringMemberNumber", "M-3101000")
-                .given("memberNumber", "M-3101000")
+                .given("adoptingMemberNumber", "M-4303000")
+                .given("transferredValue", 2*64)
                 .given("comment", "reverting some incorrect transfer transaction")
                 .given("dateOfIncorrectTransaction", "2024-02-15")
                 .doRun();

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/JsonOptional.java

@@ -0,0 +1,44 @@
+package net.hostsharing.hsadminng.hs.office.scenarios;
+
+
+public final class JsonOptional<V> {
+
+    private final boolean jsonValueGiven;
+    private final V jsonValue;
+
+    private JsonOptional() {
+        this.jsonValueGiven = false;
+        this.jsonValue = null;
+    }
+
+    private JsonOptional(final V jsonValue) {
+        this.jsonValueGiven = true;
+        this.jsonValue = jsonValue;
+    }
+
+    public static <T> JsonOptional<T> ofValue(final T value) {
+        return new JsonOptional<>(value);
+    }
+
+    public static <T> JsonOptional<T> notGiven() {
+        return new JsonOptional<>();
+    }
+
+    public V given() {
+        if (!jsonValueGiven) {
+            throw new IllegalStateException("JSON value was not given");
+        }
+        return jsonValue;
+    }
+
+    public String givenAsString() {
+        if (jsonValue instanceof Double doubleValue) {
+            if (doubleValue % 1 == 0) {
+                return String.valueOf(doubleValue.intValue()); // avoid trailing ".0"
+            } else {
+                return doubleValue.toString();
+            }
+        }
+        return jsonValue == null ? null : jsonValue.toString();
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/PathAssertion.java

@@ -19,7 +19,7 @@ public class PathAssertion {
     public Consumer<UseCase.HttpResponse> contains(final String resolvableValue) {
         return response -> {
             try {
-                response.path(path).map(this::asString).contains(ScenarioTest.resolve(resolvableValue, DROP_COMMENTS));
+                response.path(path).isEqualTo(ScenarioTest.resolve(resolvableValue, DROP_COMMENTS));
             } catch (final AssertionError e) {
                 // without this, the error message is often lacking important context
                 fail(e.getMessage() + " in `path(\"" + path +  "\").contains(\"" + resolvableValue + "\")`" );
@@ -37,15 +37,4 @@ public class PathAssertion {
             }
         };
     }
-
-    private String asString(final Object value) {
-        if (value instanceof Double doubleValue) {
-            if (doubleValue % 1 == 0) {
-                return String.valueOf(doubleValue.intValue()); // avoid trailing ".0"
-            } else {
-                return doubleValue.toString();
-            }
-        }
-        return value.toString();
-    }
 }

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/ScenarioTest.java

@@ -16,6 +16,7 @@ import org.springframework.boot.test.web.server.LocalServerPort;
 import org.testcontainers.shaded.org.apache.commons.lang3.ObjectUtils;
 
 import java.lang.reflect.Method;
+import java.math.BigDecimal;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
@@ -160,6 +161,10 @@ public abstract class ScenarioTest extends ContextBasedTest {
         properties.put(name, (value instanceof String string) ? resolveTyped(string) : value);
     }
 
+    static void removeProperty(final String propName) {
+        properties.remove(propName);
+    }
+
     static Map<String, Object> knowVariables() {
         final var map = new LinkedHashMap<String, Object>();
         ScenarioTest.aliases.forEach((key, value) -> map.put(key, value.uuid()));
@@ -172,8 +177,8 @@ public abstract class ScenarioTest extends ContextBasedTest {
         return resolved;
     }
 
-    public static Object resolveTyped(final String text) {
+    public static Object resolveTyped(final String resolvableText) {
-        final var resolved = resolve(text, DROP_COMMENTS);
+        final var resolved = resolve(resolvableText, DROP_COMMENTS);
         try {
             return UUID.fromString(resolved);
         } catch (final IllegalArgumentException e) {
@@ -182,4 +187,14 @@ public abstract class ScenarioTest extends ContextBasedTest {
         return resolved;
     }
 
+    public static <T> T resolveTyped(final String resolvableText, final Class<T> valueType) {
+        final var resolvedValue = resolve(resolvableText, DROP_COMMENTS);
+        if (valueType == BigDecimal.class) {
+            //noinspection unchecked
+            return (T) new BigDecimal(resolvedValue);
+        }
+        //noinspection unchecked
+        return (T) resolvedValue;
+    }
+
 }

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/TestReport.java

@@ -12,9 +12,12 @@ import java.io.IOException;
 import java.io.PrintWriter;
 import java.lang.reflect.Method;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.Map;
+import java.util.regex.Pattern;
 
+import static java.lang.String.join;
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class TestReport {
@@ -41,9 +44,12 @@ public class TestReport {
     }
 
     public void createTestLogMarkdownFile(final TestInfo testInfo) throws IOException {
-        final var testMethodName = testInfo.getTestMethod().map(Method::getName).orElseThrow();
+        final var testMethodName = testInfo.getTestMethod().map(Method::getName)
+                .map(TestReport::chopShouldPrefix)
+                .map(TestReport::splitMixedCaseIntoSeparateWords)
+                .orElseThrow();
         final var testMethodOrder = testInfo.getTestMethod().map(m -> m.getAnnotation(Order.class).value()).orElseThrow();
-        markdownReportFile = new File(BUILD_DOC_SCENARIOS, testMethodOrder + "-" + testMethodName + ".md");
+        markdownReportFile = new File(BUILD_DOC_SCENARIOS, testMethodOrder + ": " + testMethodName + ".md");
         markdownReport = new PrintWriter(new FileWriter(markdownReportFile));
         print("## Scenario #" + determineScenarioTitle(testInfo));
     }
@@ -119,6 +125,20 @@ public class TestReport {
         return result.toString();
     }
 
+    private static String chopShouldPrefix(final String text) {
+        return text.replaceAll("^should", "");
+    }
+
+    private static String splitMixedCaseIntoSeparateWords(final String text) {
+        final var WORD_FINDER = Pattern.compile("(([A-Z]?[a-z]+)|([A-Z]))");
+        final var matcher = WORD_FINDER.matcher(text);
+        final var words = new ArrayList<String>();
+        while (matcher.find()) {
+            words.add(matcher.group(0));
+        }
+        return join(" ", words);
+    }
+
     @SneakyThrows
     private String currentGitBranch() {
         try {

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/UseCase.java

@@ -9,13 +9,14 @@ import lombok.Getter;
 import lombok.SneakyThrows;
 import net.hostsharing.hsadminng.reflection.AnnotationFinder;
 import org.apache.commons.collections4.map.LinkedMap;
-import org.assertj.core.api.OptionalAssert;
+import org.assertj.core.api.AbstractStringAssert;
 import org.hibernate.AssertionFailure;
 import org.jetbrains.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 
+import jakarta.validation.constraints.NotNull;
 import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
@@ -27,13 +28,13 @@ import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.UUID;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
 import static java.net.URLEncoder.encode;
+import static java.util.stream.Collectors.joining;
 import static net.hostsharing.hsadminng.hs.office.scenarios.TemplateResolver.Resolver.DROP_COMMENTS;
 import static net.hostsharing.hsadminng.hs.office.scenarios.TemplateResolver.Resolver.KEEP_COMMENTS;
 import static net.hostsharing.hsadminng.test.DebuggerDetection.isDebuggerAttached;
@@ -95,6 +96,9 @@ public abstract class UseCase<T extends UseCase<?>> {
         );
         final var response = run();
         verify(response);
+
+        resetProperties();
+
         return response;
     }
 
@@ -109,7 +113,7 @@ public abstract class UseCase<T extends UseCase<?>> {
     }
 
     public final UseCase<T> given(final String propName, final Object propValue) {
-        givenProperties.put(propName, propValue);
+        givenProperties.put(propName, ScenarioTest.resolve(propValue == null ? null : propValue.toString(), KEEP_COMMENTS));
         ScenarioTest.putProperty(propName, propValue);
         return this;
     }
@@ -206,7 +210,8 @@ public abstract class UseCase<T extends UseCase<?>> {
         return new PathAssertion(path);
     }
 
-    protected void verify(
+    @SafeVarargs
+    protected final void verify(
             final String title,
             final Supplier<UseCase.HttpResponse> http,
             final Consumer<UseCase.HttpResponse>... assertions) {
@@ -236,12 +241,17 @@ public abstract class UseCase<T extends UseCase<?>> {
         String resolvePlaceholders() {
             return ScenarioTest.resolve(template, DROP_COMMENTS);
         }
+
     }
 
     private static Duration seconds(final int secondsIfNoDebuggerAttached) {
         return isDebuggerAttached() ? Duration.ofHours(1) : Duration.ofSeconds(secondsIfNoDebuggerAttached);
     }
 
+    private void resetProperties() {
+        givenProperties.forEach((propName, val) -> ScenarioTest.removeProperty(propName));
+    }
+
     public final class HttpResponse {
 
         @Getter
@@ -319,22 +329,25 @@ public abstract class UseCase<T extends UseCase<?>> {
         }
 
         @SneakyThrows
-        public String getFromBody(final String path) {
+        public <V> V getFromBody(final String path) {
-            return JsonPath.parse(response.body()).read(ScenarioTest.resolve(path, DROP_COMMENTS));
+            final var body = response.body();
+            final var resolvedPath = ScenarioTest.resolve(path, DROP_COMMENTS);
+            return JsonPath.parse(body).read(resolvedPath);
         }
 
+        @NotNull
         @SneakyThrows
-        public <T> Optional<T> getFromBodyAsOptional(final String path) {
+        public <V> JsonOptional<V> getFromBodyAsOptional(final String path) {
             try {
-                return Optional.ofNullable(JsonPath.parse(response.body()).read(ScenarioTest.resolve(path, DROP_COMMENTS)));
+                return JsonOptional.ofValue(getFromBody(path));
             } catch (final PathNotFoundException e) {
-                return null; // means the property did not exist at all, not that it was there with value null
+                return JsonOptional.notGiven();
             }
         }
 
         @SneakyThrows
-        public <T> OptionalAssert<T> path(final String path) {
+        public AbstractStringAssert<?> path(final String path) {
-            return assertThat(getFromBodyAsOptional(path));
+            return assertThat(getFromBodyAsOptional(path).givenAsString());
         }
 
         @SneakyThrows
@@ -396,4 +409,12 @@ public abstract class UseCase<T extends UseCase<?>> {
     private String title(String resultAlias) {
         return getClass().getSimpleName().replaceAll("([a-z])([A-Z]+)", "$1 $2") + " => " + resultAlias;
     }
+
+    @Override
+    public String toString() {
+        final var properties = givenProperties.entrySet().stream()
+                .map(e -> "\t" + e.getKey() + "=" + e.getValue())
+                .collect(joining("\n"));
+        return getClass().getSimpleName() + "(\n\t" + properties + "\n)";
+    }
 }

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/membership/coopassets/CreateCoopAssetsRevertSimpleTransaction.java

@@ -2,15 +2,15 @@ package net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets;
 
 import net.hostsharing.hsadminng.hs.office.scenarios.ScenarioTest;
 
-public class CreateCoopAssetsRevertTransaction extends CreateCoopAssetsTransaction {
+public class CreateCoopAssetsRevertSimpleTransaction extends CreateCoopAssetsTransaction {
 
-    public CreateCoopAssetsRevertTransaction(final ScenarioTest testSuite) {
+    public CreateCoopAssetsRevertSimpleTransaction(final ScenarioTest testSuite) {
         super(testSuite);
 
         requires("CoopAssets-Transaction with incorrect assetValue", alias ->
                 new CreateCoopAssetsDepositTransaction(testSuite)
                         .given("memberNumber", "%{memberNumber}")
-                        .given("reference", "sign %{dateOfIncorrectTransaction}") // same as relatedAssetTx
+                        .given("reference", "sign %{dateOfIncorrectTransaction}") // same text as relatedAssetTx
                         .given("assetValue", 10)
                         .given("comment", "coop-assets deposit transaction with wrong asset value")
                         .given("transactionDate", "%{dateOfIncorrectTransaction}")
@@ -21,7 +21,9 @@ public class CreateCoopAssetsRevertTransaction extends CreateCoopAssetsTransacti
     protected HttpResponse run() {
         given("transactionType", "REVERSAL");
         given("assetValue", -10);
+        given("reference", "sign %{dateOfIncorrectTransaction}"); // same text as relatedAssetTx
         given("revertedAssetTx", uuid("CoopAssets-Transaction with incorrect assetValue"));
+        given("transactionDate", "%{dateOfIncorrectTransaction}");
         return super.run();
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/membership/coopassets/CreateCoopAssetsRevertTransferTransaction.java

@@ -0,0 +1,59 @@
+package net.hostsharing.hsadminng.hs.office.scenarios.membership.coopassets;
+
+import io.restassured.http.ContentType;
+import net.hostsharing.hsadminng.hs.office.scenarios.ScenarioTest;
+import net.hostsharing.hsadminng.hs.office.scenarios.UseCase;
+import org.springframework.http.HttpStatus;
+
+import java.math.BigDecimal;
+
+import static net.hostsharing.hsadminng.hs.office.scenarios.ScenarioTest.resolveTyped;
+
+public class CreateCoopAssetsRevertTransferTransaction extends CreateCoopAssetsTransaction {
+
+    public CreateCoopAssetsRevertTransferTransaction(final ScenarioTest testSuite) {
+        super(testSuite);
+
+        requires("Accidental CoopAssets-TRANSFER-Transaction", alias ->
+                new CreateCoopAssetsTransferTransaction(testSuite)
+                        .given("reference", "transfer %{dateOfIncorrectTransaction}")
+                        .given("valueToTransfer", "%{transferredValue}")
+                        .given("comment", "accidental transfer of assets from %{transferringMemberNumber} to %{adoptingMemberNumber}")
+                        .given("transactionDate", "%{dateOfIncorrectTransaction}")
+        );
+    }
+
+    @Override
+    protected HttpResponse run() {
+        given("transactionType", "REVERSAL");
+        given("assetValue", "%{transferredValue}");
+        given("reference", "sign %{dateOfIncorrectTransaction}"); // same text as relatedAssetTx
+        given("revertedAssetTx", uuid("Accidental CoopAssets-TRANSFER-Transaction"));
+        given("transactionDate", "%{dateOfIncorrectTransaction}");
+        return super.run();
+    }
+
+    @Override
+    protected void verify(final UseCase<CreateCoopAssetsTransaction>.HttpResponse response) {
+        super.verify(response);
+
+        final var revertedAssetTxUuid = response.getFromBody("revertedAssetTx.uuid");
+        given("negativeAssetValue", resolveTyped("%{transferredValue}", BigDecimal.class).negate());
+
+        verify("Verify Reverted Coop-Assets TRANSFER-Transaction",
+                () -> httpGet("/api/hs/office/coopassetstransactions/" + revertedAssetTxUuid)
+                        .expecting(HttpStatus.OK).expecting(ContentType.JSON),
+                path("assetValue").contains("%{negativeAssetValue}"),
+                path("comment").contains("%{comment}"),
+                path("valueDate").contains("%{transactionDate}")
+        );
+
+        final var adoptionAssetTxUuid = response.getFromBody("revertedAssetTx.['adoptionAssetTx.uuid']");
+
+        verify("Verify Related Coop-Assets ADOPTION-Transaction Also Got Reverted",
+                () -> httpGet("/api/hs/office/coopassetstransactions/" + adoptionAssetTxUuid)
+                        .expecting(HttpStatus.OK).expecting(ContentType.JSON),
+                path("reversalAssetTx.['transferAssetTx.uuid']").contains(revertedAssetTxUuid.toString())
+        );
+    }
+}

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/membership/coopassets/CreateCoopAssetsTransferTransaction.java

@@ -20,7 +20,7 @@ public class CreateCoopAssetsTransferTransaction extends CreateCoopAssetsTransac
         );
 
         requires("Membership: New AG", alias -> new CreateMembership(testSuite)
-                .given("partnerNumber", toPartnerNumber("%{adoptingMemberNumber}"))
+                .given("memberNumber", toPartnerNumber("%{adoptingMemberNumber}"))
                 .given("partnerName", "New AG")
                 .given("validFrom", "2024-11-15")
                 .given("newStatus", "ACTIVE")
@@ -34,8 +34,7 @@ public class CreateCoopAssetsTransferTransaction extends CreateCoopAssetsTransac
 
         given("memberNumber", "%{transferringMemberNumber}");
         given("transactionType", "TRANSFER");
-        given("assetValue", "-%{valueToDisburse}");
+        given("assetValue", "-%{valueToTransfer}");
-        given("assetValue", "-%{valueToDisburse}");
         return super.run();
     }
 

src/test/java/net/hostsharing/hsadminng/lambda/WithNonNullUnitTest.java

@@ -0,0 +1,30 @@
+package net.hostsharing.hsadminng.lambda;
+
+import org.junit.jupiter.api.Test;
+
+import static net.hostsharing.hsadminng.lambda.WithNonNull.withNonNull;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class WithNonNullUnitTest {
+
+    Boolean didRun = null;
+
+    @Test
+    void withNonNullRunsBodyIfNotNull() {
+        didRun = false;
+        withNonNull("test", nonNullValue -> {
+            assertThat(nonNullValue).isEqualTo("test");
+            didRun = true;
+        } );
+        assertThat(didRun).isTrue();
+    }
+
+    @Test
+    void withNonNullDoesNotRunBodyIfNull() {
+        didRun = false;
+        withNonNull(null, nonNullValue -> {
+            didRun = true;
+        } );
+        assertThat(didRun).isFalse();
+    }
+}