Parallel-processing is implemented with a special variant of asynchonous RFC.
ABAP requirements (see also the online documentation for the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword):
- The function module that you call must be marked as externally callable. This attribute is specified in the Remote function call supported field in the function module definition (transaction SE37)).
- The called function module may not include a function call to the destination "BACK".
- The calling program should not change to a new internal session after making an asynchronous RFC call. That is, you should not use SUBMIT or CALL TRANSACTION in such a report after using CALL FUNCTION STARTING NEW TASK.
- You cannot use the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword to start external programs.
Demo program (with aRFC/pRFC): ZBC_ASYNC_DEMO.