diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
index f72bb4d3..e053843f 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
@@ -136,9 +136,9 @@ public class HsOfficeCoopSharesTransactionController implements HsOfficeCoopShar
     }
 
     final BiConsumer<HsOfficeCoopSharesTransactionInsertResource, HsOfficeCoopSharesTransactionEntity> RESOURCE_TO_ENTITY_POSTMAPPER = (resource, entity) -> {
-        if ( resource.getReverseEntryUuid() != null ) {
-            entity.setAdjustedShareTx(coopSharesTransactionRepo.findByUuid(resource.getReverseEntryUuid())
-                .orElseThrow(() -> new EntityNotFoundException("ERROR: [400] reverseEntityUuid %s not found".formatted(resource.getReverseEntryUuid()))));
+        if ( resource.getAdjustedShareTxUuid() != null ) {
+            entity.setAdjustedShareTx(coopSharesTransactionRepo.findByUuid(resource.getAdjustedShareTxUuid())
+                .orElseThrow(() -> new EntityNotFoundException("ERROR: [400] adjustedShareTxUuid %s not found".formatted(resource.getAdjustedShareTxUuid()))));
         }
     };
 }
diff --git a/src/main/resources/api-definition/hs-office/hs-office-coopshares-schemas.yaml b/src/main/resources/api-definition/hs-office/hs-office-coopshares-schemas.yaml
index 4b92d77d..680321be 100644
--- a/src/main/resources/api-definition/hs-office/hs-office-coopshares-schemas.yaml
+++ b/src/main/resources/api-definition/hs-office/hs-office-coopshares-schemas.yaml
@@ -73,7 +73,7 @@ components:
                     maxLength: 48
                 comment:
                     type: string
-                reverseEntryUuid:
+                adjustedShareTxUuid:
                     type: string
                     format: uuid
             required:
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionControllerAcceptanceTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionControllerAcceptanceTest.java
index b2681451..a84c85eb 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionControllerAcceptanceTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionControllerAcceptanceTest.java
@@ -227,7 +227,7 @@ class HsOfficeCoopSharesTransactionControllerAcceptanceTest extends ContextBased
                                        "valueDate": "2022-10-30",
                                        "reference": "test ref adjustment",
                                        "comment": "some coop shares adjustment transaction",
-                                       "reverseEntryUuid": "%s"
+                                       "adjustedShareTxUuid": "%s"
                                      }
                                 """.formatted(
                     givenMembership.getUuid(),
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntityUnitTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntityUnitTest.java
index 1d865b0a..44ade22c 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntityUnitTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntityUnitTest.java
@@ -51,23 +51,23 @@ class HsOfficeCoopSharesTransactionEntityUnitTest {
     }
 
     @Test
-    void toShortStringContainsOnlyMemberNumberAndShareCountOnly() {
+    void toShortStringContainsOnlyAbbreviatedString() {
         final var result = givenCoopSharesTransaction.toShortString();
 
-        assertThat(result).isEqualTo("M-1000101+4");
+        assertThat(result).isEqualTo("M-1000101:SUB:+4");
     }
 
     @Test
     void toStringEmptyTransactionDoesNotThrowException() {
         final var result = givenEmptyCoopSharesTransaction.toString();
 
-        assertThat(result).isEqualTo("CoopShareTransaction(0)");
+        assertThat(result).isEqualTo("CoopShareTransaction(null: 0)");
     }
 
     @Test
     void toShortStringEmptyTransactionDoesNotThrowException() {
         final var result = givenEmptyCoopSharesTransaction.toShortString();
 
-        assertThat(result).isEqualTo("null+0");
+        assertThat(result).isEqualTo("null:nul:+0");
     }
 }