How to DEBUG a function module running in background mode? Please help!

Question

Hi Experts,
   I am calling a function module in my ABAP code in background module using the following syntax:
  CALL FUNCTION 'YBBC2_CREATE_SNAPSHOT' IN BACKGROUND TASK
          TABLES
            itab_std_format_inv = itab_std_format_inv
            itab_snapshot_inv = itab_snapshot_inv.
        COMMIT WORK.
If I put the breakpoint in the CALL FUNCTION line and execute the program, the debugger does not take me to the valled function module. This may be because I am running the function module as background task.
I cannot comment this  "IN BACKGROUND TASK" statement as well since i am debugging in Quality system where I don't have change access.
So how to DEBUG a function module running in background mode? Please help!
Thanks
Gopal

Answer 1

Hi,
You could try to use the following trick:
(1) Put an endless loop into the coding of your function module where you want to start debugging, e.g.
  DATA:
    lx_exit_loop(1)     TYPE c.
  lx_exit_loop = ' '.
  DO.
    IF ( lx_exit_loop = 'X' ).
      EXIT.
    ENDIF.
  ENDDO.
(2) Call your function module in background task
(3) Call transaction SM50 and search for the background process.
(3) Choose from menu Program/Mode -> Program -> Debugging
Now you the debugger should bring you right to your endless loop. Set lx_loop_exit = 'X' in the debugger and continue (F5 or F6).
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Regards