Enqueue for work item n deleted by called application

Question

Hi All
We upgraded from 4.6C till ECC6.0 and from then we receive occasionaly messages in SM21: Enqueue for work item 000001198539 deleted by called application.
This results in problems when 2 dialog task are executes after each other. Somethimes the second taks is not executed. I find in the log the following errors:
- Temporary error in result processing of work item 000001199739
- Error when loading component: Work item 000001198388 locked
- Work item 000001198388 locked by user WF-BATCH (enqueue error)
This is the head of the WF that's locked..
We implemented all relevant OSS notes regarding the message, but still we receive those messages (notes 1040693 - 1050793 etc) We are on support package SAPKB70012.
I have checked the code in our custom WF and in some background task we use a DEQUEUE_ALL. Can this be the problem? The WF worked perfectly in 4.6C.
  CALL FUNCTION 'ENQUEUE_EFBKPF'
   EXPORTING
*   MODE_BKPF            = 'E'
*   MANDT                = SY-MANDT
     bukrs                = i_bukrs
     belnr                = i_belnr
     gjahr                = i_gjahr
*   X_BUKRS              = ' '
*   X_BELNR              = ' '
*   X_GJAHR              = ' '
*   _SCOPE               = '2'
     _wait                = 'X'
*   _COLLECT             = ' '
   EXCEPTIONS
     foreign_lock         = 1
     system_failure       = 2
     OTHERS               = 3
  IF sy-subrc <> 0.
    RAISE locked.
  ENDIF.
  UPDATE vbsegk SET zlspr = i_zlspr
                WHERE ausbk = i_bukrs
                  AND belnr = i_belnr
                  AND gjahr = i_gjahr.
*                and ( zlspr = 'A' or zlspr = 'Y' ) .
  COMMIT WORK AND WAIT.
  CALL FUNCTION 'DEQUEUE_ALL'
       EXPORTING
            _synchron = 'X'.
Any help appriciated
Kristof

Answer 1

The entries we have solved by removing the DEQUEUE_ALL function in a method.
Still we receive somethimes errors in the workflow log
Temporary error in result processing of work item <n>
Message no. SWP030
Error when loading component: Work item <n> locked
Message no. SWP034
Work item <n> locked by user WF-BATCH (enqueue error)
Message no. WL605