Return function module result to HCM form using backend service

Question

Hi
I'm trying todo something very simple.
I would like to call a FM using a backend service and return the result of the FM to the HCM form.
I'm using USER_EVENT_CHECK on button to initiate the call.
Here is my dooperations, I have omitted the calling of the FM.  I just want to return the changed text to the form in this example.
I have stepped through code using external breakpoint and the field gets changed succesfully in the service_dataset
method IF_HRASR00GEN_SERVICE~DO_OPERATIONS.
  DATA service_operation_wa TYPE hrasr00genserv_operation.
  DATA service_dataset_wa TYPE hrasr00gensrv_dataset.
  DATA dummy TYPE string.
  DATA message TYPE symsg.
  FIELD-SYMBOLS <service_dataset_wa> TYPE hrasr00gensrv_dataset.
  DATA inputText TYPE string.
  LOOP AT service_operations INTO service_operation_wa.
    CASE service_operation_wa-operation.
      WHEN C_CVRT_OPERATION_NAME.
        LOOP AT service_datasets INTO service_dataset_wa WHERE fieldname = c_oldText_fieldname.
          inputText = service_dataset_wa-fieldvalue.
         MODIFY service_datasets INDEX sy-tabix  FROM service_dataset_wa TRANSPORTING fieldvalue.
          exit.
        ENDLOOP.
        LOOP AT service_datasets ASSIGNING <service_dataset_wa> WHERE fieldname = c_newText_fieldname.
          EXIT.
        ENDLOOP.
        IF sy-subrc = 0. "entry found; must not necessarily exist
          CONCATENATE inputText '-TEST-' inputText INTO <service_dataset_wa>-fieldvalue.
        ENDIF.
    ENDCASE.
  ENDLOOP.
endmethod.
Any help will be appreciated.

Answer 1

You could use 'CU_READ_RGDIR_NEW' to get payroll directory RGDIR, 'PYXX_READ_PAYROLL_RESULT' to read results (RT, CRT, ...) from specific entry in payroll drectory.
Rgds.