diff --git a/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java b/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
index f28d418d..e8e01b87 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
@@ -23,6 +23,7 @@ import java.util.UUID;
 import java.util.function.BiConsumer;
 
 import static net.hostsharing.hsadminng.mapper.PostgresDateRange.toPostgresDateRange;
+import static org.modelmapper.convention.MatchingStrategies.STRICT;
 
 @RestController
 public class HsBookingItemController implements HsBookingItemsApi {
@@ -62,7 +63,8 @@ public class HsBookingItemController implements HsBookingItemsApi {
 
         context.define(currentSubject, assumedRoles);
 
-        final var entityToSave = mapper.map(body, HsBookingItemRbacEntity.class, RESOURCE_TO_ENTITY_POSTMAPPER);
+        final var entityToSave = mapper.withMatchingStrategy(STRICT)
+                .map(body, HsBookingItemRbacEntity.class, RESOURCE_TO_ENTITY_POSTMAPPER);
         final var mapped = new BookingItemEntitySaveProcessor(em, entityToSave)
                 .preprocessEntity()
                 .validateEntity()
diff --git a/src/main/java/net/hostsharing/hsadminng/mapper/Mapper.java b/src/main/java/net/hostsharing/hsadminng/mapper/Mapper.java
index 91dc725d..a8355aaf 100644
--- a/src/main/java/net/hostsharing/hsadminng/mapper/Mapper.java
+++ b/src/main/java/net/hostsharing/hsadminng/mapper/Mapper.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.mapper;
 
 import org.modelmapper.ModelMapper;
+import org.modelmapper.spi.MatchingStrategy;
 import org.springframework.util.ReflectionUtils;
 
 import jakarta.persistence.EntityManager;
@@ -15,7 +16,6 @@ import java.util.stream.Stream;
 
 import static java.util.Arrays.stream;
 import static net.hostsharing.hsadminng.errors.DisplayAs.DisplayName;
-import static org.modelmapper.convention.MatchingStrategies.STRICT;
 
 /**
  * A nicer API for ModelMapper.
@@ -26,8 +26,17 @@ public class Mapper extends ModelMapper {
     EntityManager em;
 
     public Mapper() {
-        // make sure that resource.whateverUuid does not get mapped to entity.uuid, if resource.uuid does not exist
-        getConfiguration().setMatchingStrategy(STRICT);
+        getConfiguration().setAmbiguityIgnored(true);
+    }
+
+    /** Use STRICT to make sure that resource.whateverUuid does not accidentally get mapped to entity.uuid,
+     *  if resource.uuid does not exist
+     *
+     * @return this
+     */
+    public Mapper withMatchingStrategy(final MatchingStrategy matchingStrategy) {
+        getConfiguration().setMatchingStrategy(matchingStrategy);
+        return this;
     }
 
     public <S, T> List<T> mapList(final List<S> source, final Class<T> targetClass) {