How to take back the control from RFC function module to calling program

Hi,
In our system landscape, more than 200 child systems are connected to Solution manager(SMP). I have copied a RFC enabled function module into all the child systems and calling that FM from Sol Man in sychronous mode.
Here goes my code in SolMan.
LOOP AT it_dest INTO wa_dest.
CALL FUNCTION 'Z_GET_LOGIN_DETAILS' DESTINATION wa_dest-rfcdest
    EXPORTING
      date_fr               = s_date-low
      date_to               = s_date-high
    TABLES
      tab_data              = it_val
    EXCEPTIONS
      communication_failure = 1
      system_failure        = 2
      OTHERS                = 3.
IF sy-subrc EQ 0.
*     Updates zuserlogon
      MODIFY zt_logon_det FROM TABLE it_val.
      COMMIT WORK.
      WRITE:/'RFC for Destination', wa_dest-rfcdest, 'succesfully updated.'.
ELSE.
      WRITE:/'RFC for Destination', wa_dest-rfcdest, ' failed.'.
ENDIF.
ENDLOOP.
Few child systems are very slow & takes more than 20 minutes(Many of the times system hangs) to return the result. But I should not wait for so long. Even if the child system doesn't return any values in 5 minutes I shoud continue with other system ignoring the current one.
I tried calling the FM in asynchronous mode(STARTING NEW TASK) but no success because only 6 DIA processes possible but as I said I have more than 200 systems connected to SolMan.
Please help me resolving this problem.
Thanks,
Prathap

If there are only few child systems with bad response time, use asynchronous call using a CALL FUNCTION func STARTING NEW TASK task DESTINATION dest PERFORMING subr or CALLING meth ON END OF TASK. Count asynchronous calls still running/waiting (increment a counter when creating a task (not the one used for task id). In the form/method performed at end of a call decrement the counter. When counter is lower than a limit, 4-5 if 6 processes (*), perform an asynchronous call else perform a synchronous call or wait until the counter falls below the limit.
Regards,
Raymond
(*) Use SPBT_INITIALIZE at start of program to get actual number of free/available processes.

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How to take back the control from RFC function module to calling program

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