diff --git a/lib/taskana-core/src/main/java/pro/taskana/task/internal/TaskServiceImpl.java b/lib/taskana-core/src/main/java/pro/taskana/task/internal/TaskServiceImpl.java
index 3d76f8bfba..17955f7914 100644
--- a/lib/taskana-core/src/main/java/pro/taskana/task/internal/TaskServiceImpl.java
+++ b/lib/taskana-core/src/main/java/pro/taskana/task/internal/TaskServiceImpl.java
@@ -247,6 +247,13 @@ public Task createTask(Task taskToCreate)
         throw new InvalidArgumentException("taskId must be empty when creating a task");
       }
 
+      if (Objects.nonNull(task.getAttachments()) && !task.getAttachments().isEmpty()
+              && task.getAttachments().stream()
+              .anyMatch(a -> Objects.nonNull(a.getTaskId()) && !a.getTaskId().isEmpty())) {
+        throw new InvalidArgumentException(
+                "attachments' taskId must be empty when creating a task");
+      }
+
       if (LOGGER.isDebugEnabled()) {
         LOGGER.debug("Task {} cannot be found, so it can be created.", task.getId());
       }
diff --git a/rest/taskana-rest-spring/src/test/java/pro/taskana/task/rest/TaskControllerIntTest.java b/rest/taskana-rest-spring/src/test/java/pro/taskana/task/rest/TaskControllerIntTest.java
index 5147319217..b6dbc8c564 100644
--- a/rest/taskana-rest-spring/src/test/java/pro/taskana/task/rest/TaskControllerIntTest.java
+++ b/rest/taskana-rest-spring/src/test/java/pro/taskana/task/rest/TaskControllerIntTest.java
@@ -19,6 +19,7 @@
 import java.util.stream.Stream;
 import javax.sql.DataSource;
 import org.assertj.core.api.ThrowableAssert.ThrowingCallable;
+import org.assertj.core.util.Lists;
 import org.junit.jupiter.api.DynamicTest;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -42,6 +43,7 @@
 import pro.taskana.rest.test.TaskanaSpringBootTest;
 import pro.taskana.sampledata.SampleDataGenerator;
 import pro.taskana.task.api.TaskState;
+import pro.taskana.task.rest.models.AttachmentRepresentationModel;
 import pro.taskana.task.rest.models.IsReadRepresentationModel;
 import pro.taskana.task.rest.models.ObjectReferenceRepresentationModel;
 import pro.taskana.task.rest.models.TaskRepresentationModel;
@@ -114,6 +116,34 @@ void should_UpdateTaskOwnerOfReadyForReviewTask() {
     assertThat(theUpdatedTaskRepresentationModel.getOwner()).isEqualTo("dummyUser");
   }
 
+  private ObjectReferenceRepresentationModel getObjectReferenceResourceSample() {
+    ObjectReferenceRepresentationModel objectReference = new ObjectReferenceRepresentationModel();
+    objectReference.setCompany("MyCompany1");
+    objectReference.setSystem("MySystem1");
+    objectReference.setSystemInstance("MyInstance1");
+    objectReference.setType("MyType1");
+    objectReference.setValue("00000001");
+    return objectReference;
+  }
+
+  private AttachmentRepresentationModel getAttachmentResourceSample() {
+    AttachmentRepresentationModel attachmentRepresentationModel =
+            new AttachmentRepresentationModel();
+    attachmentRepresentationModel.setAttachmentId("A11010");
+
+    attachmentRepresentationModel.setObjectReference(getObjectReferenceResourceSample());
+
+    ClassificationSummaryRepresentationModel classificationSummaryRepresentationModel =
+            new ClassificationSummaryRepresentationModel();
+    classificationSummaryRepresentationModel
+            .setClassificationId("CLI:100000000000000000000000000000000004");
+    classificationSummaryRepresentationModel.setKey("L11010");
+
+    attachmentRepresentationModel
+            .setClassificationSummary(classificationSummaryRepresentationModel);
+    return attachmentRepresentationModel;
+  }
+
   private TaskRepresentationModel getTaskResourceSample() {
     ClassificationSummaryRepresentationModel classificationResource =
         new ClassificationSummaryRepresentationModel();
@@ -1475,6 +1505,27 @@ void should_CreateAndDeleteTask() {
       assertThat(responseDeleted.getStatusCode()).isEqualTo(HttpStatus.NO_CONTENT);
     }
 
+    @Test
+    void should_CreateTaskWithError_When_SpecifyingAttachmentWrong() {
+      TaskRepresentationModel taskRepresentationModel = getTaskResourceSample();
+      AttachmentRepresentationModel attachmentRepresentationModel = getAttachmentResourceSample();
+      attachmentRepresentationModel.setTaskId(taskRepresentationModel.getTaskId() + "wrongId");
+      taskRepresentationModel.setAttachments(Lists.newArrayList(attachmentRepresentationModel));
+
+      String url = restHelper.toUrl(RestEndpoints.URL_TASKS);
+      HttpEntity<TaskRepresentationModel> auth =
+              new HttpEntity<>(
+                      taskRepresentationModel, RestHelper.generateHeadersForUser("teamlead-1"));
+
+      ThrowingCallable httpCall =
+              () -> TEMPLATE.exchange(url, HttpMethod.POST, auth, TASK_MODEL_TYPE);
+
+      assertThatThrownBy(httpCall)
+              .extracting(HttpStatusCodeException.class::cast)
+              .extracting(HttpStatusCodeException::getStatusCode)
+              .isEqualTo(HttpStatus.BAD_REQUEST);
+    }
+
     @Test
     void should_CreateAndDeleteTaskWithSecondaryObjectReferences_When_SpecifyingObjectReferences() {
       TaskRepresentationModel taskRepresentationModel = getTaskResourceSample();