src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java

@@ -1,7 +1,10 @@
 package net.hostsharing.hsadminng.hs.office.coopshares;
 
+import jakarta.persistence.EntityNotFoundException;
 import net.hostsharing.hsadminng.context.Context;
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionEntity;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeCoopSharesApi;
+import net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopAssetsTransactionInsertResource;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopSharesTransactionInsertResource;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopSharesTransactionResource;
 import net.hostsharing.hsadminng.mapper.Mapper;
@@ -18,6 +21,7 @@ import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
+import java.util.function.BiConsumer;
 
 import static java.lang.String.join;
 import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeCoopSharesTransactionTypeResource.CANCELLATION;
@@ -64,7 +68,7 @@ public class HsOfficeCoopSharesTransactionController implements HsOfficeCoopShar
         context.define(currentUser, assumedRoles);
         validate(requestBody);
 
-        final var entityToSave = mapper.map(requestBody, HsOfficeCoopSharesTransactionEntity.class);
+        final var entityToSave = mapper.map(requestBody, HsOfficeCoopSharesTransactionEntity.class, RESOURCE_TO_ENTITY_POSTMAPPER);
 
         final var saved = coopSharesTransactionRepo.save(entityToSave);
 
@@ -131,4 +135,10 @@ public class HsOfficeCoopSharesTransactionController implements HsOfficeCoopShar
         }
     }
 
+    final BiConsumer<HsOfficeCoopSharesTransactionInsertResource, HsOfficeCoopSharesTransactionEntity> RESOURCE_TO_ENTITY_POSTMAPPER = (resource, entity) -> {
+        if ( resource.getAdjustedShareTxUuid() != null ) {
+            entity.setAdjustedShareTx(coopSharesTransactionRepo.findByUuid(resource.getAdjustedShareTxUuid())
+                .orElseThrow(() -> new EntityNotFoundException("ERROR: [400] adjustedShareTxUuid %s not found".formatted(resource.getAdjustedShareTxUuid()))));
+        }
+    };
 }

src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntity.java

@@ -6,6 +6,7 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import net.hostsharing.hsadminng.errors.DisplayName;
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionEntity;
 import net.hostsharing.hsadminng.hs.office.membership.HsOfficeMembershipEntity;
 import net.hostsharing.hsadminng.rbac.rbacdef.RbacView;
 import net.hostsharing.hsadminng.rbac.rbacobject.RbacObject;
@@ -41,12 +42,14 @@ import static net.hostsharing.hsadminng.stringify.Stringify.stringify;
 public class HsOfficeCoopSharesTransactionEntity implements Stringifyable, RbacObject {
 
     private static Stringify<HsOfficeCoopSharesTransactionEntity> stringify = stringify(HsOfficeCoopSharesTransactionEntity.class)
-            .withProp(HsOfficeCoopSharesTransactionEntity::getMemberNumberTagged)
+            .withIdProp(HsOfficeCoopSharesTransactionEntity::getMemberNumberTagged)
             .withProp(HsOfficeCoopSharesTransactionEntity::getValueDate)
             .withProp(HsOfficeCoopSharesTransactionEntity::getTransactionType)
             .withProp(HsOfficeCoopSharesTransactionEntity::getShareCount)
             .withProp(HsOfficeCoopSharesTransactionEntity::getReference)
             .withProp(HsOfficeCoopSharesTransactionEntity::getComment)
+            .withProp(at -> ofNullable(at.getAdjustedShareTx()).map(HsOfficeCoopSharesTransactionEntity::toShortString).orElse(null))
+            .withProp(at -> ofNullable(at.getAdjustmentShareTx()).map(HsOfficeCoopSharesTransactionEntity::toShortString).orElse(null))
         .quotedValues(false);
 
     @Id
@@ -89,6 +92,16 @@ public class HsOfficeCoopSharesTransactionEntity implements Stringifyable, RbacO
     @Column(name = "comment")
     private String comment;
 
+    /**
+     * Optionally, the UUID of the corresponding transaction for an adjustment transaction.
+     */
+    @OneToOne
+    @JoinColumn(name = "adjustedsharetxuuid")
+    private HsOfficeCoopSharesTransactionEntity adjustedShareTx;
+
+    @OneToOne(mappedBy = "adjustedShareTx")
+    private HsOfficeCoopSharesTransactionEntity adjustmentShareTx;
+
     @Override
     public String toString() {
         return stringify.apply(this);
@@ -100,7 +113,7 @@ public class HsOfficeCoopSharesTransactionEntity implements Stringifyable, RbacO
 
     @Override
     public String toShortString() {
-        return "%s%+d".formatted(getMemberNumberTagged(), shareCount);
+        return "%s:%.3s:%+d".formatted(getMemberNumberTagged(), transactionType, shareCount);
     }
 
     public static RbacView rbac() {

src/main/resources/api-definition/hs-office/hs-office-coopshares-schemas.yaml

@@ -12,6 +12,31 @@ components:
 
         HsOfficeCoopSharesTransaction:
             type: object
+            properties:
+                uuid:
+                    type: string
+                    format: uuid
+                transactionType:
+                    $ref: '#/components/schemas/HsOfficeCoopSharesTransactionType'
+                shareCount:
+                    type: integer
+                valueDate:
+                   type: string
+                   format: date
+                reference:
+                    type: string
+                comment:
+                    type: string
+                adjustedShareTx:
+                    $ref: '#/components/schemas/HsOfficeReferencedCoopSharesTransaction'
+                adjustmentShareTx:
+                    $ref: '#/components/schemas/HsOfficeReferencedCoopSharesTransaction'
+
+        HsOfficeReferencedCoopSharesTransaction:
+            description:
+                Similar to `HsOfficeCoopSharesTransaction` but without the self-referencing properties
+                (`adjustedShareTx` and `adjustmentShareTx`), to avoid recursive JSON.
+            type: object
             properties:
                 uuid:
                     type: string
@@ -48,6 +73,9 @@ components:
                     maxLength: 48
                 comment:
                     type: string
+                adjustedShareTxUuid:
+                    type: string
+                    format: uuid
             required:
                 - membershipUuid
                 - transactionType

src/main/resources/db/changelog/5-hs-office/511-coopshares/5110-hs-office-coopshares.sql

@@ -15,12 +15,23 @@ create table if not exists hs_office_coopsharestransaction
     membershipUuid  uuid not null references hs_office_membership(uuid),
     transactionType HsOfficeCoopSharesTransactionType not null,
     valueDate       date not null,
-    shareCount      integer,
-    reference       varchar(48),
+    shareCount      integer not null,
+    reference       varchar(48) not null,
+    adjustedShareTxUuid uuid unique REFERENCES hs_office_coopsharestransaction(uuid) DEFERRABLE INITIALLY DEFERRED,
     comment         varchar(512)
 );
 --//
 
+-- ============================================================================
+--changeset hs-office-coopshares-BUSINESS-RULES:1 endDelimiter:--//
+-- ----------------------------------------------------------------------------
+
+alter table hs_office_coopsharestransaction
+    add constraint hs_office_coopsharestransaction_reverse_entry_missing
+        check ( transactionType = 'ADJUSTMENT' and adjustedShareTxUuid is not null
+             or transactionType <> 'ADJUSTMENT' and adjustedShareTxUuid is null);
+--//
+
 -- ============================================================================
 --changeset hs-office-coopshares-SHARE-COUNT-CONSTRAINT:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------

src/main/resources/db/changelog/5-hs-office/511-coopshares/5118-hs-office-coopshares-test-data.sql

@@ -16,9 +16,11 @@ create or replace procedure createHsOfficeCoopSharesTransactionTestData(
 declare
     currentTask             varchar;
     membership              hs_office_membership;
+    subscriptionEntryUuid   uuid;
 begin
     currentTask = 'creating coopSharesTransaction test-data ' || givenPartnerNumber::text || givenMemberNumberSuffix;
     execute format('set local hsadminng.currentTask to %L', currentTask);
+    SET CONSTRAINTS ALL DEFERRED;
 
     call defineContext(currentTask);
     select m.uuid
@@ -29,12 +31,14 @@ begin
         into membership;
 
     raise notice 'creating test coopSharesTransaction: %', givenPartnerNumber::text || givenMemberNumberSuffix;
+    subscriptionEntryUuid := uuid_generate_v4();
     insert
-        into hs_office_coopsharestransaction(uuid, membershipuuid, transactiontype, valuedate, sharecount, reference, comment)
+        into hs_office_coopsharestransaction(uuid, membershipuuid, transactiontype, valuedate, sharecount, reference, comment, adjustedShareTxUuid)
         values
-            (uuid_generate_v4(), membership.uuid, 'SUBSCRIPTION', '2010-03-15', 4, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-1', 'initial subscription'),
-            (uuid_generate_v4(), membership.uuid, 'CANCELLATION', '2021-09-01', -2, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-2', 'cancelling some'),
-            (uuid_generate_v4(), membership.uuid, 'ADJUSTMENT', '2022-10-20', 2, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-3', 'some adjustment');
+            (uuid_generate_v4(), membership.uuid, 'SUBSCRIPTION', '2010-03-15', 4, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-1', 'initial subscription', null),
+            (uuid_generate_v4(), membership.uuid, 'CANCELLATION', '2021-09-01', -2, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-2', 'cancelling some', null),
+            (subscriptionEntryUuid,       membership.uuid, 'SUBSCRIPTION',    '2022-10-20',  2, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-3', 'some subscription', null),
+            (uuid_generate_v4(), membership.uuid, 'ADJUSTMENT', '2022-10-21', -2, 'ref '||givenPartnerNumber::text || givenMemberNumberSuffix||'-4', 'some adjustment', subscriptionEntryUuid);
 end; $$;
 --//
 

src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionControllerAcceptanceTest.java

@@ -4,6 +4,8 @@ import io.restassured.RestAssured;
 import io.restassured.http.ContentType;
 import net.hostsharing.hsadminng.HsadminNgApplication;
 import net.hostsharing.hsadminng.context.Context;
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionEntity;
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionRawEntity;
 import net.hostsharing.hsadminng.hs.office.membership.HsOfficeMembershipRepository;
 import net.hostsharing.hsadminng.hs.office.test.ContextBasedTestWithCleanup;
 import net.hostsharing.test.Accepts;
@@ -19,9 +21,12 @@ import org.springframework.transaction.annotation.Transactional;
 
 import jakarta.persistence.EntityManager;
 import jakarta.persistence.PersistenceContext;
+
+import java.math.BigDecimal;
 import java.time.LocalDate;
 import java.util.UUID;
 
+import static net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionType.DEPOSIT;
 import static net.hostsharing.test.IsValidUuidMatcher.isUuidValid;
 import static net.hostsharing.test.JsonMatcher.lenientlyEquals;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -69,7 +74,15 @@ class HsOfficeCoopSharesTransactionControllerAcceptanceTest extends ContextBased
         void globalAdmin_canViewAllCoopSharesTransactions() {
 
             RestAssured // @formatter:off
-                .given().header("current-user", "superuser-alex@hostsharing.net").port(port).when().get("http://localhost/api/hs/office/coopsharestransactions").then().log().all().assertThat().statusCode(200).contentType("application/json").body("", hasSize(9));  // @formatter:on
+                .given()
+                    .header("current-user", "superuser-alex@hostsharing.net")
+                    .port(port)
+                .when()
+                    .get("http://localhost/api/hs/office/coopsharestransactions")
+                .then().log().all().assertThat()
+                    .statusCode(200)
+                    .contentType("application/json")
+                    .body("", hasSize(12));  // @formatter:on
         }
 
         @Test
@@ -96,12 +109,33 @@ class HsOfficeCoopSharesTransactionControllerAcceptanceTest extends ContextBased
                             "comment": "cancelling some"
                         },
                         {
-                            "transactionType": "ADJUSTMENT",
+                                "transactionType": "SUBSCRIPTION",
                                 "shareCount": 2,
                                 "valueDate": "2022-10-20",
                                 "reference": "ref 1000202-3",
+                                "comment": "some subscription",
+                                "adjustmentShareTx": {
+                                    "transactionType": "ADJUSTMENT",
+                                    "shareCount": -2,
+                                    "valueDate": "2022-10-21",
+                                    "reference": "ref 1000202-4",
                                     "comment": "some adjustment"
                                 }
+                            },
+                        {
+                            "transactionType": "ADJUSTMENT",
+                            "shareCount": -2,
+                            "valueDate": "2022-10-21",
+                            "reference": "ref 1000202-4",
+                            "comment": "some adjustment",
+                            "adjustedShareTx": {
+                                    "transactionType": "SUBSCRIPTION",
+                                    "shareCount": 2,
+                                    "valueDate": "2022-10-20",
+                                    "reference": "ref 1000202-3",
+                                    "comment": "some subscription"
+                            }
+                        }
                     ]
                     """)); // @formatter:on
         }
@@ -159,8 +193,76 @@ class HsOfficeCoopSharesTransactionControllerAcceptanceTest extends ContextBased
                     """)).header("Location", startsWith("http://localhost")).extract().header("Location");  // @formatter:on
 
             // finally, the new coopSharesTransaction can be accessed under the generated UUID
-            final var newUserUuid = UUID.fromString(location.substring(location.lastIndexOf('/') + 1));
-            assertThat(newUserUuid).isNotNull();
+            final var newShareTxUuid = UUID.fromString(location.substring(location.lastIndexOf('/') + 1));
+            assertThat(newShareTxUuid).isNotNull();
+        }
+
+        @Test
+        void globalAdmin_canAddCoopSharesAdjustmentTransaction() {
+
+            context.define("superuser-alex@hostsharing.net");
+            final var givenMembership = membershipRepo.findMembershipByMemberNumber(1000101);
+            final var givenTransaction = jpaAttempt.transacted(() -> {
+                // TODO.impl: introduce something like transactedAsSuperuser / transactedAs("...", ...)
+                context.define("superuser-alex@hostsharing.net");
+                return coopSharesTransactionRepo.save(HsOfficeCoopSharesTransactionEntity.builder()
+                    .transactionType(HsOfficeCoopSharesTransactionType.SUBSCRIPTION)
+                    .valueDate(LocalDate.of(2022, 10, 20))
+                    .membership(givenMembership)
+                    .shareCount(13)
+                    .reference("test ref")
+                    .build());
+            }).assertSuccessful().assertNotNull().returnedValue();
+            toCleanup(HsOfficeCoopSharesTransactionRawEntity.class, givenTransaction.getUuid());
+
+            final var location = RestAssured // @formatter:off
+                .given()
+                .header("current-user", "superuser-alex@hostsharing.net")
+                .contentType(ContentType.JSON)
+                .body("""
+                                   {
+                                       "membershipUuid": "%s",
+                                       "transactionType": "ADJUSTMENT",
+                                       "shareCount": %s,
+                                       "valueDate": "2022-10-30",
+                                       "reference": "test ref adjustment",
+                                       "comment": "some coop shares adjustment transaction",
+                                       "adjustedShareTxUuid": "%s"
+                                     }
+                                """.formatted(
+                    givenMembership.getUuid(),
+                    -givenTransaction.getShareCount(),
+                    givenTransaction.getUuid()))
+                .port(port)
+                .when()
+                .post("http://localhost/api/hs/office/coopsharestransactions")
+                .then().log().all().assertThat()
+                .statusCode(201)
+                .contentType(ContentType.JSON)
+                .body("uuid", isUuidValid())
+                .body("", lenientlyEquals("""
+                            {
+                                "transactionType": "ADJUSTMENT",
+                                "shareCount": -13,
+                                "valueDate": "2022-10-30",
+                                "reference": "test ref adjustment",
+                                "comment": "some coop shares adjustment transaction",
+                                "adjustedShareTx": {
+                                    "transactionType": "SUBSCRIPTION",
+                                    "shareCount": 13,
+                                    "valueDate": "2022-10-20",
+                                    "reference": "test ref"
+                                }
+                            }
+                            """))
+                .header("Location", startsWith("http://localhost"))
+                .extract().header("Location");  // @formatter:on
+
+            // finally, the new coopAssetsTransaction can be accessed under the generated UUID
+            final var newShareTxUuid = UUID.fromString(
+                location.substring(location.lastIndexOf('/') + 1));
+            assertThat(newShareTxUuid).isNotNull();
+            toCleanup(HsOfficeCoopSharesTransactionRawEntity.class, newShareTxUuid);
         }
 
         @Test
@@ -169,7 +271,7 @@ class HsOfficeCoopSharesTransactionControllerAcceptanceTest extends ContextBased
             context.define("superuser-alex@hostsharing.net");
             final var givenMembership = membershipRepo.findMembershipByMemberNumber(1000101);
 
-            final var location = RestAssured // @formatter:off
+            RestAssured // @formatter:off
                 .given().header("current-user", "superuser-alex@hostsharing.net").contentType(ContentType.JSON).body("""
                     {
                         "membershipUuid": "%s",

src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionEntityUnitTest.java

@@ -1,7 +1,10 @@
 package net.hostsharing.hsadminng.hs.office.coopshares;
 
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionEntity;
+import net.hostsharing.hsadminng.hs.office.coopassets.HsOfficeCoopAssetsTransactionType;
 import org.junit.jupiter.api.Test;
 
+import java.math.BigDecimal;
 import java.time.LocalDate;
 
 import static net.hostsharing.hsadminng.hs.office.membership.TestHsMembership.TEST_MEMBERSHIP;
@@ -15,34 +18,56 @@ class HsOfficeCoopSharesTransactionEntityUnitTest {
             .valueDate(LocalDate.parse("2020-01-01"))
             .transactionType(HsOfficeCoopSharesTransactionType.SUBSCRIPTION)
             .shareCount(4)
+            .comment("some comment")
             .build();
+
+
+    final HsOfficeCoopSharesTransactionEntity givenCoopShareAdjustmentTransaction = HsOfficeCoopSharesTransactionEntity.builder()
+        .membership(TEST_MEMBERSHIP)
+        .reference("some-ref")
+        .valueDate(LocalDate.parse("2020-01-15"))
+        .transactionType(HsOfficeCoopSharesTransactionType.ADJUSTMENT)
+        .shareCount(-4)
+        .comment("some comment")
+        .adjustedShareTx(givenCoopSharesTransaction)
+        .build();
+
     final HsOfficeCoopSharesTransactionEntity givenEmptyCoopSharesTransaction = HsOfficeCoopSharesTransactionEntity.builder().build();
 
     @Test
-    void toStringContainsAlmostAllPropertiesAccount() {
+    void toStringContainsAllNonNullProperties() {
         final var result = givenCoopSharesTransaction.toString();
 
-        assertThat(result).isEqualTo("CoopShareTransaction(M-1000101, 2020-01-01, SUBSCRIPTION, 4, some-ref)");
+        assertThat(result).isEqualTo("CoopShareTransaction(M-1000101: 2020-01-01, SUBSCRIPTION, 4, some-ref, some comment)");
     }
 
     @Test
-    void toShortStringContainsOnlyMemberNumberAndShareCountOnly() {
+    void toStringWithReverseEntryContainsReverseEntry() {
+        givenCoopSharesTransaction.setAdjustedShareTx(givenCoopShareAdjustmentTransaction);
+
+        final var result = givenCoopSharesTransaction.toString();
+
+        assertThat(result).isEqualTo("CoopShareTransaction(M-1000101: 2020-01-01, SUBSCRIPTION, 4, some-ref, some comment, M-1000101:ADJ:-4)");
+    }
+
+    @Test
+    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");
     }
 }

src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionRawEntity.java

@@ -0,0 +1,18 @@
+
+package net.hostsharing.hsadminng.hs.office.coopshares;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import lombok.NoArgsConstructor;
+
+import java.util.UUID;
+
+@Entity
+@Table(name = "hs_office_coopsharestransaction")
+@NoArgsConstructor
+public class HsOfficeCoopSharesTransactionRawEntity {
+
+    @Id
+    private UUID uuid;
+}

src/test/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionRepositoryIntegrationTest.java

@@ -126,7 +126,7 @@ class HsOfficeCoopSharesTransactionRepositoryIntegrationTest extends ContextBase
     class FindAllCoopSharesTransactions {
 
         @Test
-        public void globalAdmin_anViewAllCoopSharesTransactions() {
+        public void globalAdmin_canViewAllCoopSharesTransactions() {
             // given
             context("superuser-alex@hostsharing.net");
 
@@ -137,19 +137,22 @@ class HsOfficeCoopSharesTransactionRepositoryIntegrationTest extends ContextBase
                     null);
 
             // then
-            allTheseCoopSharesTransactionsAreReturned(
+            exactlyTheseCoopSharesTransactionsAreReturned(
                     result,
-                    "CoopShareTransaction(M-1000101, 2010-03-15, SUBSCRIPTION, 4, ref 1000101-1, initial subscription)",
-                    "CoopShareTransaction(M-1000101, 2021-09-01, CANCELLATION, -2, ref 1000101-2, cancelling some)",
-                    "CoopShareTransaction(M-1000101, 2022-10-20, ADJUSTMENT, 2, ref 1000101-3, some adjustment)",
+                    "CoopShareTransaction(M-1000101: 2010-03-15, SUBSCRIPTION, 4, ref 1000101-1, initial subscription)",
+                    "CoopShareTransaction(M-1000101: 2021-09-01, CANCELLATION, -2, ref 1000101-2, cancelling some)",
+                    "CoopShareTransaction(M-1000101: 2022-10-20, SUBSCRIPTION, 2, ref 1000101-3, some subscription, M-1000101:ADJ:-2)",
+                    "CoopShareTransaction(M-1000101: 2022-10-21, ADJUSTMENT, -2, ref 1000101-4, some adjustment, M-1000101:SUB:+2)",
 
-                    "CoopShareTransaction(M-1000202, 2010-03-15, SUBSCRIPTION, 4, ref 1000202-1, initial subscription)",
-                    "CoopShareTransaction(M-1000202, 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)",
-                    "CoopShareTransaction(M-1000202, 2022-10-20, ADJUSTMENT, 2, ref 1000202-3, some adjustment)",
+                    "CoopShareTransaction(M-1000202: 2010-03-15, SUBSCRIPTION, 4, ref 1000202-1, initial subscription)",
+                    "CoopShareTransaction(M-1000202: 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)",
+                    "CoopShareTransaction(M-1000202: 2022-10-20, SUBSCRIPTION, 2, ref 1000202-3, some subscription, M-1000202:ADJ:-2)",
+                    "CoopShareTransaction(M-1000202: 2022-10-21, ADJUSTMENT, -2, ref 1000202-4, some adjustment, M-1000202:SUB:+2)",
 
-                    "CoopShareTransaction(M-1000303, 2010-03-15, SUBSCRIPTION, 4, ref 1000303-1, initial subscription)",
-                    "CoopShareTransaction(M-1000303, 2021-09-01, CANCELLATION, -2, ref 1000303-2, cancelling some)",
-                    "CoopShareTransaction(M-1000303, 2022-10-20, ADJUSTMENT, 2, ref 1000303-3, some adjustment)");
+                    "CoopShareTransaction(M-1000303: 2010-03-15, SUBSCRIPTION, 4, ref 1000303-1, initial subscription)",
+                    "CoopShareTransaction(M-1000303: 2021-09-01, CANCELLATION, -2, ref 1000303-2, cancelling some)",
+                    "CoopShareTransaction(M-1000303: 2022-10-20, SUBSCRIPTION, 2, ref 1000303-3, some subscription, M-1000303:ADJ:-2)",
+                    "CoopShareTransaction(M-1000303: 2022-10-21, ADJUSTMENT, -2, ref 1000303-4, some adjustment, M-1000303:SUB:+2)");
         }
 
         @Test
@@ -165,11 +168,12 @@ class HsOfficeCoopSharesTransactionRepositoryIntegrationTest extends ContextBase
                     null);
 
             // then
-            allTheseCoopSharesTransactionsAreReturned(
+            exactlyTheseCoopSharesTransactionsAreReturned(
                     result,
-                    "CoopShareTransaction(M-1000202, 2010-03-15, SUBSCRIPTION, 4, ref 1000202-1, initial subscription)",
-                    "CoopShareTransaction(M-1000202, 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)",
-                    "CoopShareTransaction(M-1000202, 2022-10-20, ADJUSTMENT, 2, ref 1000202-3, some adjustment)");
+                    "CoopShareTransaction(M-1000202: 2010-03-15, SUBSCRIPTION, 4, ref 1000202-1, initial subscription)",
+                    "CoopShareTransaction(M-1000202: 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)",
+                    "CoopShareTransaction(M-1000202: 2022-10-20, SUBSCRIPTION, 2, ref 1000202-3, some subscription, M-1000202:ADJ:-2)",
+                    "CoopShareTransaction(M-1000202: 2022-10-21, ADJUSTMENT, -2, ref 1000202-4, some adjustment, M-1000202:SUB:+2)");
         }
 
         @Test
@@ -187,7 +191,7 @@ class HsOfficeCoopSharesTransactionRepositoryIntegrationTest extends ContextBase
             // then
             allTheseCoopSharesTransactionsAreReturned(
                     result,
-                    "CoopShareTransaction(M-1000202, 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)");
+                    "CoopShareTransaction(M-1000202: 2021-09-01, CANCELLATION, -2, ref 1000202-2, cancelling some)");
         }
 
         @Test
@@ -204,9 +208,10 @@ class HsOfficeCoopSharesTransactionRepositoryIntegrationTest extends ContextBase
             // then:
             exactlyTheseCoopSharesTransactionsAreReturned(
                     result,
-                    "CoopShareTransaction(M-1000101, 2010-03-15, SUBSCRIPTION, 4, ref 1000101-1, initial subscription)",
-                    "CoopShareTransaction(M-1000101, 2021-09-01, CANCELLATION, -2, ref 1000101-2, cancelling some)",
-                    "CoopShareTransaction(M-1000101, 2022-10-20, ADJUSTMENT, 2, ref 1000101-3, some adjustment)");
+                    "CoopShareTransaction(M-1000101: 2010-03-15, SUBSCRIPTION, 4, ref 1000101-1, initial subscription)",
+                    "CoopShareTransaction(M-1000101: 2021-09-01, CANCELLATION, -2, ref 1000101-2, cancelling some)",
+                    "CoopShareTransaction(M-1000101: 2022-10-20, SUBSCRIPTION, 2, ref 1000101-3, some subscription, M-1000101:ADJ:-2)",
+                    "CoopShareTransaction(M-1000101: 2022-10-21, ADJUSTMENT, -2, ref 1000101-4, some adjustment, M-1000101:SUB:+2)");
         }
     }
 

src/test/java/net/hostsharing/hsadminng/hs/office/migration/ImportOfficeData.java

@@ -360,10 +360,10 @@ public class ImportOfficeData extends ContextBasedTest {
 
         assertThat(toFormattedString(coopShares)).isEqualToIgnoringWhitespace("""
                 {
-                    33443=CoopShareTransaction(M-1001700, 2000-12-06, SUBSCRIPTION, 20, initial share subscription),
-                    33451=CoopShareTransaction(M-1002000, 2000-12-06, SUBSCRIPTION, 2, initial share subscription),
-                    33701=CoopShareTransaction(M-1001700, 2005-01-10, SUBSCRIPTION, 40, increase),
-                    33810=CoopShareTransaction(M-1002000, 2016-12-31, CANCELLATION, 22, membership ended)
+                    33443=CoopShareTransaction(M-1001700, 2000-12-06, SUBSCRIPTION, 20, legacy data import, initial share subscription),
+                    33451=CoopShareTransaction(M-1002000, 2000-12-06, SUBSCRIPTION, 2, legacy data import, initial share subscription),
+                    33701=CoopShareTransaction(M-1001700, 2005-01-10, SUBSCRIPTION, 40, legacy data import, increase),
+                    33810=CoopShareTransaction(M-1002000, 2016-12-31, CANCELLATION, 22, legacy data import, membership ended)
                 }
                 """);
     }
@@ -803,8 +803,19 @@ public class ImportOfficeData extends ContextBasedTest {
                             )
                             .shareCount(rec.getInteger("quantity"))
                             .comment( rec.getString("comment"))
+                            .reference("legacy data import") // TODO.spec: or use value from comment column?
                             .build();
 
+                    if (shareTransaction.getTransactionType() == HsOfficeCoopSharesTransactionType.ADJUSTMENT) {
+                        final var negativeValue = -shareTransaction.getShareCount();
+                        final var adjustedShareTx = coopShares.values().stream().filter(a ->
+                                a.getTransactionType() != HsOfficeCoopSharesTransactionType.ADJUSTMENT &&
+                                    a.getMembership() == shareTransaction.getMembership() &&
+                                    a.getShareCount() == negativeValue)
+                            .findAny()
+                            .orElseThrow(() -> new IllegalStateException("cannot determine share reverse entry for adjustment " + shareTransaction));
+                        shareTransaction.setAdjustedShareTx(adjustedShareTx);
+                    }
                     coopShares.put(rec.getInteger("member_share_id"), shareTransaction);
                 });
     }