最近在和一个朋友的交流中，遇到了这么一个需求，就是在TC中对一个字段实现帮助，然后从帮助选择值时能把文本带到TC中的文本字段中，原来没做过这种实现，只是做过回车后，通过CHAIN中的MODULE实现把文本自动带出来，这种方法比较简单，这里就不再说明了。后来找了一点资料，经过测试，用一种笨的方法实现了这个需求，应该还有更简单的方法，以后用到了再更新。现在把这种方法贴出来，与大家共享一下。希望对你有所帮助，也希望我下次能记住。
1、屏幕设计
在屏幕tc增加一列zwx-matnr,勾选输入字段复选框。
2、在逻辑流中输入以下代码
process on value-request.
field zwx-matnr module matnr_f4.
3、具体module代码
module matnr_f4.
data:
l_row like sy-tabix,
lt_return_tab type table of ddshretval，
ls_return_tab like line of lt_return_tab,
lt_systems like dynpread occurs 0 with header line.
*取出屏幕行
call function 'DYNP_GET_STEPL'
importing
povstepl = l_row.
*调用帮助函数
call function 'F4IF_FIELD_VALUE_REQUEST'
exporting
tabname = 'MARA'
fieldname = 'MATNR'
dynpprog = sy-repid
dynpnr = '0110' "你的屏幕号
dynprofield = 'ZWX-MATNR'
stepl = l_row
multiple_choice = ''
display = l_display
tables
return_tab = lt_return_tab
exceptions
field_not_found = 1
no_help_for_field = 2
inconsistent_help = 3
no_values_found = 4
others = 5.
if sy-subrc <> 0.
message id sy-msgid type sy-msgty number sy-msgno
with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
else.
*查询成功，取出物料描述放入屏幕TC中的文本字段中
read table lt_return_tab into ls_return_tab index 1.
select single 描述 into 你的描述字段 from 表 where 字段 = ls_return_tab-fieldval.
endif.
*更新屏幕上已经修改的字段
lt_systems-fieldname = '你的字段'.
lt_systems-stepl = l_row.
lt_systems-fieldvalue = ls_return_tab-fieldval. “返回的选择值
append lt_systems.
lt_systems-fieldname = '你的字段'.
lt_systems-stepl = l_row.
lt_systems-fieldvalue = 取出的文本值
append lt_systems.
call function 'DYNP_VALUES_UPDATE'
exporting
dyname = sy-repid
dynumb = '你的屏幕号'
tables
dynpfields = lt_systems
exceptions
invalid_abapworkarea = 1
invalid_dynprofield = 2
invalid_dynproname = 3
invalid_dynpronummer = 4
invalid_request = 5
no_fielddescription = 6
undefind_error = 7
others = 8.
if sy-subrc <> 0.
endif.
endmodule. " MATNR_F4
这里用物料来举例，当然也可以自己做帮助，也可以是系统的标准帮助，有兴趣的可以试一试，只有真正测试成功的时候，你才会感觉到自己又学到了新的知识！
*##############下面一种方法比上面更加清晰，简单明了，有兴趣的可以看看###############
*##################感谢云东兄提供代码 QQ：24963363#######################
REPORT zgetf4.
TYPES: shlp_descr_t TYPE shlp_descr .
DATA: BEGIN OF itab OCCURS 0 ,
matnr LIKE mara-matnr ,
maktx LIKE makt-maktx ,
END OF itab.
DATA: return_tab TYPE ddshretval OCCURS 0 .
PARAMETERS: p_matnr LIKE itab-matnr ,
p_maktx LIKE itab-maktx .
INITIALIZATION.
SELECT matnr maktx INTO TABLE itab FROM makt UP TO 20 ROWS
WHERE spras = '1'.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_matnr .
PERFORM f4.
*&---------------------------------------------------------------------*
*& Form f4
*&---------------------------------------------------------------------*
FORM f4.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'MATNR'
dynpprog = sy-repid
dynpnr = sy-dynnr
dynprofield = 'P_MATNR'
value_org = 'S'
callback_program = sy-repid
callback_form = 'CB_FORM'
TABLES
value_tab = itab
return_tab = return_tab
EXCEPTIONS
parameter_error = 1
no_values_found = 2
OTHERS = 3.
ENDFORM. "f4
*&---------------------------------------------------------------------*
*& Form cb_form
*&---------------------------------------------------------------------*
FORM cb_form TABLES record_tab STRUCTURE seahlpres
CHANGING shlp TYPE shlp_descr_t
callcontrol LIKE ddshf4ctrl.
DATA: interface LIKE LINE OF shlp-interface.
READ TABLE shlp-interface INTO interface INDEX 1.
interface-shlpfield+4(1) = '2'.
interface-valfield = 'P_MAKTX'.
APPEND interface TO shlp-interface.
ENDFORM. "bo_callback_form
