Cannot cumulate lock within update task

Question

Hi,
I am writing a BAPI to update several materials asynchronously.
1. The BAPI will lock those materials for update by ENQUEUE_EMMARAE with scope 2
2. Calls another function module IN UPDATE TASK, which calls BAPI_MATERIAL_SAVEDATA several times to update those materials.
However, the BAPI_MATERIAL_SAVEDATA fails to accumulate the lock on EMMARAE and rejects the changes.
The BAPI is to return without waiting for the material changes, but block other change attempts in the mean time.
As a work around, I tried to release the lock in the FM before locking again, but it could not be done by DEQUEUE_ALL nor DEQUEUE_EMMARAE.
Please help.
Many thanks,
MF

Answer 1

Hi again,
1. Lets take this sequence
   a) program logic
   b) enqueue
      update FM
      Commit Work and Wait
      dequeu
2. In above,
   all the 4 statements in B
   are executed immediately in sequence.
3. When update FM is called,
   it does not execute immediate.
   However,since the immediate next
   statment is commit work and WAIT,
   the update FM will execute (immediate now)
   and after completion,
   dequeu will be exectued.
4. I think this is the most shortest span
   of time, in which u won't have any problem.
regards,
amit m.