当我们在自定义选择屏幕中， 需要写入我们自定义的搜索帮助的时候，可以通过预定义函数来实现：
实例说明：
第一步：创建搜索帮助SE11分销渠道(Z_VTWEG)
1.选择基本索引帮助：
2.选择参考表，因为这里分销渠道和文本来源于TVTWT，这里选择方法就填入TVTWT，对话类型选择D立即显示值，就是点击即可出现结果。
列表的意思是排列顺序
搜索帮助出口：需要我们自定义一个函数，可复制标准函数：F4IF_SHLP_EXIT_EXAMPLE去创建
参数和预定义函数一致，这里我们调用‘SELECT’这个时间点来进行数据的查询输出，自定义的帮助出口函数中的具体代码如下
FUNCTION zsd_vtweg_f4_exit.
*“----------------------------------------------------------------------
"“本地接口：
*” TABLES
*” SHLP_TAB TYPE SHLP_DESCT
*" RECORD_TAB STRUCTURE SEAHLPRES
*" CHANGING
*" VALUE(SHLP) TYPE SHLP_DESCR
*" VALUE(CALLCONTROL) LIKE DDSHF4CTRL STRUCTURE DDSHF4CTRL
*"----------------------------------------------------------------------
DATA:BEGIN OF lt_tab OCCURS 0,
vtweg TYPE vtweg,
vtext TYPE vtxtk,
spras TYPE spras,
END OF lt_tab.
DATA:r_vtweg TYPE RANGE OF vtweg WITH HEADER LINE,
r_vtext TYPE RANGE OF vtxtk WITH HEADER LINE,
r_spras TYPE RANGE OF spras WITH HEADER LINE,
ddshelops TYPE ddshselopt.
- EXIT immediately, if you do not want to handle this step
IF callcontrol-step <> ‘SELONE’ AND
callcontrol-step <> ‘SELECT’ AND
" AND SO ON
callcontrol-step <> ‘DISP’.
EXIT.
ENDIF.
*"----------------------------------------------------------------------
- STEP SELONE (Select one of the elementary searchhelps)
*"---------------------------------------------------------------------- - This step is only called for collective searchhelps. It may be used
- to reduce the amount of elementary searchhelps given in SHLP_TAB.
- The compound searchhelp is given in SHLP.
- If you do not change CALLCONTROL-STEP, the next step is the
- dialog, to select one of the elementary searchhelps.
- If you want to skip this dialog, you have to return the selected
- elementary searchhelp in SHLP and to change CALLCONTROL-STEP to
- either to ‘PRESEL’ or to ‘SELECT’.
IF callcontrol-step = ‘SELONE’. - PERFORM SELONE …
EXIT.
ENDIF.
*"----------------------------------------------------------------------
-
STEP PRESEL (Enter selection conditions)
*"---------------------------------------------------------------------- -
This step allows you, to influence the selection conditions either
-
before they are displayed or in order to skip the dialog completely.
-
If you want to skip the dialog, you should change CALLCONTROL-STEP
-
to ‘SELECT’.
-
Normaly only SHLP-SELOPT should be changed in this step.
IF callcontrol-step = ‘PRESEL’. -
PERFORM PRESEL …
LOOP AT record_tab INTO DATA(ls_table).ENDLOOP.
EXIT.
ENDIF.
*"---------------------------------------------------------------------- -
STEP SELECT (Select values)
*"---------------------------------------------------------------------- -
This step may be used to overtake the data selection completely.
-
To skip the standard seletion, you should return ‘DISP’ as following
-
step in CALLCONTROL-STEP.
-
Normally RECORD_TAB should be filled after this step.
-
Standard function module F4UT_RESULTS_MAP may be very helpfull in this
-
step.
IF callcontrol-step = ‘SELECT’. -
PERFORM STEP_SELECT TABLES RECORD_TAB SHLP_TAB
-
CHANGING SHLP CALLCONTROL RC. -
IF RC = 0.
-
CALLCONTROL-STEP = 'DISP'. -
ELSE.
-
CALLCONTROL-STEP = 'EXIT'. -
ENDIF.
"传入参数
LOOP AT shlp-selopt INTO DATA(ls_selopt).
CASE ls_selopt-shlpfield.
WHEN ‘SPRAS’.
MOVE-CORRESPONDING ls_selopt TO r_spras.
APPEND r_spras.
WHEN OTHERS.
ENDCASE.
ENDLOOP.
"根据输入参数查询数据
SELECT * INTO CORRESPONDING FIELDS OF TABLE lt_tab FROM tvtwt WHERE spras = sy-langu.
"将查询结果回执到屏幕上来
CALL FUNCTION 'F4UT_RESULTS_MAP'
* EXPORTING
* SOURCE_STRUCTURE =
* APPLY_RESTRICTIONS = ' '
TABLES
shlp_tab = shlp_tab
record_tab = record_tab
source_tab = lt_tab
CHANGING
shlp = shlp
callcontrol = callcontrol
EXCEPTIONS
illegal_structure = 1
OTHERS = 2.
*下一个时间点直接转到DISP，否则无法再屏幕上显示帮助列表
callcontrol-step = 'DISP'.
EXIT. "Don't process STEP DISP additionally in this call.
ENDIF.
*"----------------------------------------------------------------------
* STEP DISP (Display values)
*"----------------------------------------------------------------------
* This step is called, before the selected data is displayed.
* You can e.g. modify or reduce the data in RECORD_TAB
* according to the users authority.
* If you want to get the standard display dialog afterwards, you
* should not change CALLCONTROL-STEP.
* If you want to overtake the dialog on you own, you must return
* the following values in CALLCONTROL-STEP:
* - "RETURN" if one line was selected. The selected line must be
* the only record left in RECORD_TAB. The corresponding fields of
* this line are entered into the screen.
* - "EXIT" if the values request should be aborted
* - "PRESEL" if you want to return to the selection dialog
* Standard function modules F4UT_PARAMETER_VALUE_GET and
* F4UT_PARAMETER_RESULTS_PUT may be very helpfull in this step.
IF callcontrol-step = 'DISP'.
* PERFORM AUTHORITY_CHECK TABLES RECORD_TAB SHLP_TAB
* CHANGING SHLP CALLCONTROL.
LOOP AT record_tab INTO DATA(ls_item).
ENDLOOP.
EXIT.
ENDIF.
ENDFUNCTION.
因为我这里是全部输出系统当前语言的分销渠道，所以这里的搜索没有去做限制，也可以更具具体情况去限制
3.自定义屏幕中写入参考我们的搜索帮助即可
