很多系统自带的F4特别麻烦，特别是工厂、物料等主数据，下面是一些重写F4的系统函数，仅供参考

RMMW1_ATTYP_HELP

RMMW1_EKORG_LIEFNR_HELP

RMMW1_LGORT_HELP

RMMW1_MATKL_HELP

RMMW1_VARNR_HELP

RMMW1_VKORG_HELP

RMMW1_VRKME_HELP

RMMW1_WERKS_HELP

例如：

1 FORM SUB_SITE_HELP1  USING  P_POS TYPE C. 2   DATA: L_WERKS LIKE T001W-WERKS. 3  4   CALL FUNCTION 'RMMW1_WERKS_HELP' 5     EXPORTING 6       KZ_ALL      = 'X' 7       KZ_BEW_WERK = SPACE 8       MATNR       = SPACE 9       DISPLAY     = SPACE10       KZ_LISTUNG  = 'X'11     CHANGING12       E_WERKS     = L_WERKS13     EXCEPTIONS14       OTHERS      = 1.15   IF SY-SUBRC = 0.16 17     IF P_POS = 'L'.18       S_STORE-LOW = L_WERKS.19     ELSEIF P_POS = 'H'.20       S_STORE-HIGH = L_WERKS.21     ENDIF.22   ENDIF.23 24 ENDFORM.