Support for varying primary key in parent entity during Discard draft

pom.xml

@@ -23,7 +23,7 @@
     </developers>
 
     <properties>
-        <revision>1.6.2-SNAPSHOT</revision>
+        <revision>1.0.0-RC1</revision>
         <java.version>17</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>

sdm/src/main/java/com/sap/cds/sdm/service/handler/SDMServiceGenericHandler.java

@@ -164,17 +164,20 @@ private void processNestedEntityComposition(
         return;
       }
 
+      // Get the actual key field names from the entity instead of hardcoding "ID"
+      List<String> keyElementNames = getKeyElementNames(nestedDraftEntity.get());
+
       Result nestedRecords =
           persistenceService.run(
-              Select.from(nestedDraftEntity.get())
-                  .columns("ID")
-                  .where(e -> e.get("IsActiveEntity").eq(false)));
+              Select.from(nestedDraftEntity.get()).where(e -> e.get("IsActiveEntity").eq(false)));
 
       for (Row nestedRecord : nestedRecords) {
-        Object nestedEntityId = nestedRecord.get("ID");
-
         Map<String, Object> nestedEntityKeys = new HashMap<>();
-        nestedEntityKeys.put("ID", nestedEntityId);
+
+        // Populate the key map with all actual key field names and values
+        for (String keyName : keyElementNames) {
+          nestedEntityKeys.put(keyName, nestedRecord.get(keyName));
+        }
         nestedEntityKeys.put("IsActiveEntity", false);
 
         for (Map.Entry<String, String> entry : nestedAttachmentMapping.entrySet()) {
@@ -429,6 +432,18 @@ private String getUpIdKey(CdsEntity attachmentDraftEntity) {
     return upIdKey;
   }
 
+  /**
+   * Retrieves the key element names from a CdsEntity. This method extracts the names of all key
+   * fields defined in the entity, allowing for dynamic key field handling instead of hardcoding
+   * "ID".
+   *
+   * @param entity the CdsEntity to extract key element names from
+   * @return a list of key element names
+   */
+  private List<String> getKeyElementNames(CdsEntity entity) {
+    return entity.elements().filter(CdsElement::isKey).map(CdsElement::getName).toList();
+  }
+
   private void checkAttachmentConstraints(
       EventContext context, CdsEntity attachmentDraftEntity, String upID, String upIdKey)
       throws ServiceException {