原文地址http://blog.csdn.net/liangziyisheng/article/details/6951941
F4IF_FIELD_VALUE_REQUEST主要功能是将表里的字段对应的search help引入到屏幕上来，从而打开对话框，当然也可以任意指定某个search help。
F4IF_INT_TABLE_VALUE_REQUEST支持字定义内表，但是不能通过指定search help的方式打开对话框。
1.F4IF_FIELD_VALUE_REQUEST的应用实例
TYPES: BEGIN OF type_carrid, carrid TYPE spfli-carrid, connid type spfli-connid, carrname TYPE scarr-carrname, END OF type_carrid. DATA itab_carrid TYPE STANDARD TABLE OF type_carrid. parameters airline(2) type c. *&———————————————————————* *& Processing Blocks called by the Runtime Environment * *&———————————————————————* * Event Block AT SELECTION-SCREEN ON VALUE-REQUEST FOR at selection-screen on value-request for airline. perform frm_f4_help.
* Form for generating F4 HELP for parameter AIRLINE form FRM_F4_HELP . SELECT carrid carrname FROM scarr INTO CORRESPONDING FIELDS OF TABLE itab_carrid. CALL FUNCTION ‘F4IF_FIELD_VALUE_REQUEST’ EXPORTING TABNAME = ‘SPFLI’ “指定stucture，必须的 fieldname = ‘CARRID’ “指定structure中的field dynpprog = sy-repid “指定屏幕参数所在的程序名称 dynpnr = sy-dynnr “指定参数所在的屏幕编号 dynprofield = ‘AIRLINE’. “指定屏幕参数的名称 IF sy-subrc <> 0. ... ENDIF. endform. ” FRM_F4_HELP
2.F4IF_INT_TABLE_VALUE_REQUEST的应用实例
TYPES: BEGIN OF type_carrid, carrid TYPE spfli-carrid, connid type spfli-connid, carrname TYPE scarr-carrname, END OF type_carrid. DATA itab_carrid TYPE STANDARD TABLE OF type_carrid. * Selection Screen parameters airline(2) type c.
* Event Block AT SELECTION-SCREEN ON VALUE-REQUEST FOR at selection-screen on value-request for airline. perform frm_f4_help. * Form for generating F4 HELP for parameter AIRLINE form FRM_F4_HELP . SELECT carrid carrname FROM scarr INTO CORRESPONDING FIELDS OF TABLE itab_carrid. CALL FUNCTION ‘F4IF_INT_TABLE_VALUE_REQUEST’ EXPORTING retfield = ‘CARRID’ “指定要返回屏幕参数的在内表中的field value_org = ‘S’ “S代表structure dynpprog = sy-repid “指定屏幕参数所在的程序名称 dynpnr = sy-dynnr “指定参数所在的屏幕编号 dynprofield = ‘AIRLINE’“指定屏幕参数的名称 TABLES value_tab = itab_carrid “内表 EXCEPTIONS parameter_error = 1 no_values_found = 2 OTHERS = 3. IF sy-subrc <> 0. ... ENDIF. endform. ” FRM_F4_HELP
总结：总上所述，在se11已经存在建立好的search help的情况下我们通常使用第一个function module，在需要给某个字段限定一些特殊值的时候，我们通常使用第2种function module.
