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

@@ -50,6 +50,7 @@ public class HsOfficeCoopAssetsTransactionEntity implements Stringifyable, RbacO
             .withProp(HsOfficeCoopAssetsTransactionEntity::getAssetValue)
             .withProp(HsOfficeCoopAssetsTransactionEntity::getReference)
             .withProp(HsOfficeCoopAssetsTransactionEntity::getComment)
+            .withProp(at -> ofNullable(at.getReverseEntry()).map(HsOfficeCoopAssetsTransactionEntity::toShortString).orElse(null))
             .quotedValues(false);
 
     @Id
@@ -93,6 +94,13 @@ public class HsOfficeCoopAssetsTransactionEntity implements Stringifyable, RbacO
     @Column(name = "comment")
     private String comment;
 
+    /**
+     * Optionally, the corresponding transaction for an adjustment transaction,
+     * linked in both directions.
+     */
+    @OneToOne
+    @JoinColumn(name = "reverseentryuuid")
+    private HsOfficeCoopAssetsTransactionEntity reverseEntry;
 
     public String getTaggedMemberNumber() {
         return ofNullable(membership).map(HsOfficeMembershipEntity::toShortString).orElse("M-?????");

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

@@ -22,8 +22,9 @@ create table if not exists hs_office_coopassetstransaction
     membershipUuid      uuid not null references hs_office_membership(uuid),
     transactionType     HsOfficeCoopAssetsTransactionType not null,
     valueDate           date not null,
-    assetValue      money,
+    assetValue          money not null,
-    reference       varchar(48),
+    reference           varchar(48) not null,
+    reverseEntryUuid    uuid references hs_office_coopassetstransaction (uuid),
     comment             varchar(512)
 );
 --//

src/test/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionEntityUnitTest.java

@@ -16,14 +16,36 @@ class HsOfficeCoopAssetsTransactionEntityUnitTest {
             .valueDate(LocalDate.parse("2020-01-01"))
             .transactionType(HsOfficeCoopAssetsTransactionType.DEPOSIT)
             .assetValue(new BigDecimal("128.00"))
+            .comment("some comment")
             .build();
+
+
+    final HsOfficeCoopAssetsTransactionEntity givenCoopAssetAdjustmentTransaction = HsOfficeCoopAssetsTransactionEntity.builder()
+            .membership(TEST_MEMBERSHIP)
+            .reference("some-ref")
+            .valueDate(LocalDate.parse("2020-01-15"))
+            .transactionType(HsOfficeCoopAssetsTransactionType.ADJUSTMENT)
+            .assetValue(new BigDecimal("-128.00"))
+            .comment("some comment")
+            .reverseEntry(givenCoopAssetTransaction)
+            .build();
+
     final HsOfficeCoopAssetsTransactionEntity givenEmptyCoopAssetsTransaction = HsOfficeCoopAssetsTransactionEntity.builder().build();
 
     @Test
-    void toStringContainsAlmostAllPropertiesAccount() {
+    void toStringContainsAllNonNullProperties() {
         final var result = givenCoopAssetTransaction.toString();
 
-        assertThat(result).isEqualTo("CoopAssetsTransaction(M-1000101: 2020-01-01, DEPOSIT, 128.00, some-ref)");
+        assertThat(result).isEqualTo("CoopAssetsTransaction(M-1000101: 2020-01-01, DEPOSIT, 128.00, some-ref, some comment)");
+    }
+
+    @Test
+    void toStringWithReverseEntryContainsReverseEntry() {
+        givenCoopAssetTransaction.setReverseEntry(givenCoopAssetAdjustmentTransaction);
+
+        final var result = givenCoopAssetTransaction.toString();
+
+        assertThat(result).isEqualTo("CoopAssetsTransaction(M-1000101: 2020-01-01, DEPOSIT, 128.00, some-ref, some comment, M-1000101:-128.00)");
     }
 
     @Test