diff --git a/lib/taskana-core/src/test/java/acceptance/task/QueryTasksByWorkbasketAccTest.java b/lib/taskana-core/src/test/java/acceptance/task/QueryTasksByWorkbasketAccTest.java
index 5078f437e..715880bee 100644
--- a/lib/taskana-core/src/test/java/acceptance/task/QueryTasksByWorkbasketAccTest.java
+++ b/lib/taskana-core/src/test/java/acceptance/task/QueryTasksByWorkbasketAccTest.java
@@ -60,7 +60,7 @@ public class QueryTasksByWorkbasketAccTest extends AbstractAccTest {
         List<TaskSummary> results = taskService.createTaskQuery()
             .domainIn("DOMAIN_B", "", "DOMAIN_A")
             .list();
-        assertThat(results.size(), equalTo(41));
+        assertThat(results.size(), equalTo(45));
 
         results = taskService.createTaskQuery()
             .domainIn("DOMAIN_A")
diff --git a/lib/taskana-core/src/test/java/acceptance/task/WorkOnTaskAccTest.java b/lib/taskana-core/src/test/java/acceptance/task/WorkOnTaskAccTest.java
index 063cb6f56..297471588 100644
--- a/lib/taskana-core/src/test/java/acceptance/task/WorkOnTaskAccTest.java
+++ b/lib/taskana-core/src/test/java/acceptance/task/WorkOnTaskAccTest.java
@@ -7,6 +7,7 @@ import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import java.sql.SQLException;
+import java.util.ArrayList;
 
 import org.h2.store.fs.FileUtils;
 import org.junit.AfterClass;
@@ -17,7 +18,9 @@ import org.junit.runner.RunWith;
 import acceptance.AbstractAccTest;
 import pro.taskana.Task;
 import pro.taskana.TaskService;
+import pro.taskana.exceptions.AttachmentPersistenceException;
 import pro.taskana.exceptions.ClassificationNotFoundException;
+import pro.taskana.exceptions.ConcurrencyException;
 import pro.taskana.exceptions.InvalidArgumentException;
 import pro.taskana.exceptions.InvalidOwnerException;
 import pro.taskana.exceptions.InvalidStateException;
@@ -240,6 +243,61 @@ public class WorkOnTaskAccTest extends AbstractAccTest {
         assertEquals("user_1_2", completedTask.getOwner());
     }
 
+    @Ignore
+    @WithAccessId(
+        userName = "user_1_2",
+        groupNames = {"group_1"})
+    @Test(expected = TaskNotFoundException.class)
+    public void testBulkCompleteTasks()
+        throws SQLException, NotAuthorizedException, InvalidArgumentException, ClassificationNotFoundException,
+        WorkbasketNotFoundException, TaskAlreadyExistException, InvalidWorkbasketException, TaskNotFoundException,
+        ConcurrencyException, AttachmentPersistenceException {
+
+        TaskService taskService = taskanaEngine.getTaskService();
+        ArrayList<String> taskIdList = new ArrayList();
+        taskIdList.add("TKI:000000000000000000000000000000000100");
+        taskIdList.add("TKI:000000000000000000000000000000000101");
+
+        // BulkOperationResults results = taskService.completeTasks(taskIdList);
+
+        // assertFalse(results.containsError());
+        Task completedTask1 = taskService.getTask("TKI:000000000000000000000000000000000100");
+        assertEquals(TaskState.COMPLETED, completedTask1.getState());
+        assertNotNull(completedTask1.getCompleted());
+        Task completedTask2 = taskService.getTask("TKI:000000000000000000000000000000000101");
+        assertEquals(TaskState.COMPLETED, completedTask2.getState());
+        assertNotNull(completedTask2.getCompleted());
+    }
+
+    @Ignore
+    @WithAccessId(
+        userName = "user_1_2",
+        groupNames = {"group_1"})
+    @Test(expected = TaskNotFoundException.class)
+    public void testBulkDeleteTasksWithException()
+        throws SQLException, NotAuthorizedException, InvalidArgumentException, ClassificationNotFoundException,
+        WorkbasketNotFoundException, TaskAlreadyExistException, InvalidWorkbasketException, TaskNotFoundException,
+        ConcurrencyException, AttachmentPersistenceException {
+
+        TaskService taskService = taskanaEngine.getTaskService();
+        ArrayList<String> taskIdList = new ArrayList();
+        taskIdList.add("TKI:000000000000000000000000000000000102");
+        taskIdList.add("TKI:000000000000000000000000000000000103");
+        taskIdList.add("TKI:000000000000000000000000000000000033");
+
+        // BulkOperationResults results = taskService.deleteTasks(taskIdList);
+
+        // assertTrue(results.containsError());
+        // more assertions ...
+        // assert exception is invalidstateexception
+        Task completedTask1 = taskService.getTask("TKI:000000000000000000000000000000000102");
+        assertEquals(TaskState.COMPLETED, completedTask1.getState());
+        assertNotNull(completedTask1.getCompleted());
+        Task completedTask2 = taskService.getTask("TKI:000000000000000000000000000000000103");
+        assertEquals(TaskState.COMPLETED, completedTask2.getState());
+        assertNotNull(completedTask2.getCompleted());
+    }
+
     @AfterClass
     public static void cleanUpClass() {
         FileUtils.deleteRecursive("~/data", true);
diff --git a/lib/taskana-core/src/test/resources/sql/task.sql b/lib/taskana-core/src/test/resources/sql/task.sql
index 05da039e7..ebdac67ba 100644
--- a/lib/taskana-core/src/test/resources/sql/task.sql
+++ b/lib/taskana-core/src/test/resources/sql/task.sql
@@ -36,6 +36,10 @@ INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000032', '2018-01-29
 INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000033', '2018-01-29 15:55:24', null                 , null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'READY'      , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000033' , 'DOC_0000000000000000033' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
 INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000034', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000034' , 'DOC_0000000000000000034' , 'user_1_1'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
 INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000035', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000035' , 'DOC_0000000000000000035' , 'user_1_1'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
+INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000100', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000100' , 'DOC_0000000000000000100' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
+INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000101', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000101' , 'DOC_0000000000000000101' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
+INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000102', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000102' , 'DOC_0000000000000000102' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
+INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000103', '2018-01-29 15:55:24', '2018-01-30 15:55:24', null                 , '2018-01-30 15:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'CLAIMED'    , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000103' , 'DOC_0000000000000000103' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '98765432'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
 -- Tasks for DeleteTaskAccTest
 INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000036', '2018-01-29 15:55:24', '2018-01-30 15:55:24', '2018-01-30 16:55:24', '2018-01-30 16:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'COMPLETED'  , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000036' , 'DOC_0000000000000000036' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '00011122'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );
 INSERT INTO TASK VALUES('TKI:000000000000000000000000000000000037', '2018-01-29 15:55:24', '2018-01-30 15:55:24', '2018-01-30 16:55:24', '2018-01-30 16:55:24', '2018-01-29 15:55:00', '2018-01-30 15:55:00', 'Widerruf'                , 'Widerruf'                                 , null                                     , 2       , 'COMPLETED'  , 'L1050'           , 'USER_1_2'    , 'DOMAIN_A', 'PI_0000000000037' , 'DOC_0000000000000000037' , 'user_1_2'  , '00'        , 'PASystem' , '00'               , 'SDNR'   , '00011122'     , true   , false         , null             , null   , null   , null   , null   , null   , null   , null   , null   , null   , null     );