confusion points on calling function

 

  CALL FUNCTION m_fm
       EXPORTING    "exporting ,a gerund,can be understood as exporting data from main prg to target(eg .forms)
         ZTWRBTR = ZTWRBTR
         zliushui = zliushui
*          CONTROL_PARAMETERS         = wa_control_par
*          OUTPUT_OPTIONS             = wa_out_option
        IMPORTING
          JOB_OUTPUT_INFO            = ws_job_info
      TABLES
        p_itab_h                   = gt_head
        p_itab_d                   = gt_itemv
      EXCEPTIONS
        formatting_error           = 1
        internal_error             = 2
        send_error                 = 3
        user_canceled              = 4
        OTHERS                     = 5

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