ABAP 时间月份的F4帮助

*选择屏幕SELECTION-SCREEN BEGIN OF BLOCK blk WITH FRAME TITLE text-001.PARAMETERS: p_date TYPE isellist-month,SELECTION-SCREEN END OF BLOCK blk .AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_date.  PERFORM select_data.*&---------------------------------------------------------------------**&      Form  SELECT_DATA*&---------------------------------------------------------------------**       text*----------------------------------------------------------------------**  -->  p1        text*  <--  p2        text*----------------------------------------------------------------------*FORM select_data .  CALL FUNCTION 'POPUP_TO_SELECT_MONTH'    EXPORTING      actual_month   = sy-datum+0(6)    IMPORTING      selected_month = p_date.  "传入参数值  IF sy-subrc <> 0.  ENDIF.ENDFORM.                    " SELECT_DATA