diff --git a/lib/taskana-core/src/test/java/acceptance/AbstractAccTest.java b/lib/taskana-core/src/test/java/acceptance/AbstractAccTest.java
index 31e1bfb1b..9289562d1 100644
--- a/lib/taskana-core/src/test/java/acceptance/AbstractAccTest.java
+++ b/lib/taskana-core/src/test/java/acceptance/AbstractAccTest.java
@@ -1,6 +1,8 @@
 package acceptance;
 
 import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
 
 import javax.sql.DataSource;
 
@@ -53,4 +55,12 @@ public abstract class AbstractAccTest {
         return objectReference;
     }
 
+    protected Map<String, Object> createSimpleCustomProperties(int propertiesCount) {
+        HashMap<String, Object> properties = new HashMap<>();
+        for (int i = 1; i <= propertiesCount; i++) {
+            properties.put("Property_" + i, "Property Value of Property_" + i);
+        }
+        return properties;
+    }
+
 }
diff --git a/lib/taskana-core/src/test/java/acceptance/task/CreateTaskAccTest.java b/lib/taskana-core/src/test/java/acceptance/task/CreateTaskAccTest.java
index 55ecd6155..f4cd8c0e7 100644
--- a/lib/taskana-core/src/test/java/acceptance/task/CreateTaskAccTest.java
+++ b/lib/taskana-core/src/test/java/acceptance/task/CreateTaskAccTest.java
@@ -66,6 +66,86 @@ public class CreateTaskAccTest extends AbstractAccTest {
         assertEquals(false, createdTask.isTransferred());
     }
 
+    @Ignore
+    @WithAccessId(
+        userName = "user_1_1",
+        groupNames = { "group_1" })
+    @Test
+    public void testCreateExternalTaskWithAttachment()
+        throws SQLException, NotAuthorizedException, InvalidArgumentException, ClassificationNotFoundException,
+        WorkbasketNotFoundException, TaskAlreadyExistException, InvalidWorkbasketException {
+
+        TaskService taskService = taskanaEngine.getTaskService();
+        Task newTask = taskService.newTask();
+        newTask.setClassification(taskanaEngine.getClassificationService().getClassification("L12010", "DOMAIN_A"));
+        newTask.setPrimaryObjRef(createObjectReference("COMPANY_A", "SYSTEM_A", "INSTANCE_A", "VNR", "1234567"));
+        newTask.setWorkbasketKey("USER_1_1");
+        // newTask.addAttachment(createAttachment("DOKTYP_DEFAULT",
+        // createObjectReference("COMPANY_A", "SYSTEM_B", "INSTANCE_B", "ArchiveId",
+        // "12345678901234567890123456789012345678901234567890"),
+        // "E-MAIL", "2018-01-15", createSimpleCustomProperties(3)));
+        Task createdTask = taskService.createTask(newTask);
+
+        assertNotNull(createdTask);
+        // assertNotNull(createdTask.getAttachments());
+        // assertEquals(1, createdTask.getAttachments().size());
+    }
+
+    @Ignore
+    @WithAccessId(
+        userName = "user_1_1",
+        groupNames = { "group_1" })
+    @Test
+    public void testCreateExternalTaskWithMultipleAttachments()
+        throws SQLException, NotAuthorizedException, InvalidArgumentException, ClassificationNotFoundException,
+        WorkbasketNotFoundException, TaskAlreadyExistException, InvalidWorkbasketException {
+
+        TaskService taskService = taskanaEngine.getTaskService();
+        Task newTask = taskService.newTask();
+        newTask.setClassification(taskanaEngine.getClassificationService().getClassification("L12010", "DOMAIN_A"));
+        newTask.setPrimaryObjRef(createObjectReference("COMPANY_A", "SYSTEM_A", "INSTANCE_A", "VNR", "1234567"));
+        newTask.setWorkbasketKey("USER_1_1");
+        // newTask.addAttachment(createAttachment("DOKTYP_DEFAULT",
+        // createObjectReference("COMPANY_A", "SYSTEM_B", "INSTANCE_B", "ArchiveId",
+        // "12345678901234567890123456789012345678901234567890"),
+        // "E-MAIL", "2018-01-15", createSimpleCustomProperties(3)));
+        // newTask.addAttachment(createAttachment("DOKTYP_DEFAULT",
+        // createObjectReference("COMPANY_A", "SYSTEM_B", "INSTANCE_B", "ArchiveId",
+        // "12345678901234567890123456789012345678901234567890"),
+        // "E-MAIL", "2018-01-15", createSimpleCustomProperties(3)));
+        Task createdTask = taskService.createTask(newTask);
+
+        assertNotNull(createdTask);
+        // assertNotNull(createdTask.getAttachments());
+        // assertEquals(2, createdTask.getAttachments().size());
+        // further assertions
+    }
+
+    @Ignore
+    @WithAccessId(
+        userName = "user_1_1",
+        groupNames = { "group_1" })
+    @Test
+    public void testThrowsExceptionIfAttachmentIsInvalid()
+        throws SQLException, NotAuthorizedException, InvalidArgumentException, ClassificationNotFoundException,
+        WorkbasketNotFoundException, TaskAlreadyExistException, InvalidWorkbasketException {
+
+        TaskService taskService = taskanaEngine.getTaskService();
+        Task newTask = taskService.newTask();
+        newTask.setClassification(taskanaEngine.getClassificationService().getClassification("L12010", "DOMAIN_A"));
+        newTask.setPrimaryObjRef(createObjectReference("COMPANY_A", "SYSTEM_A", "INSTANCE_A", "VNR", "1234567"));
+        newTask.setWorkbasketKey("USER_1_1");
+        // newTask.addAttachment(createAttachment("DOKTYP_DEFAULT",
+        // null,
+        // "E-MAIL", "2018-01-15", createSimpleCustomProperties(3)));
+        Task createdTask = taskService.createTask(newTask);
+
+        // Further exceptions
+        // null in object reference
+        //
+
+    }
+
     @WithAccessId(
         userName = "user_1_1",
         groupNames = { "group_1" })