Problem is Module pool custom F4 help

In module pool selection screen . I have defined vendor field as a select option and attached a custom search help to it . Now the problem is that when i press F4 on that field and select a value from the help , that value is not populated in the input field .
The other problem is that if we keep this vendor select option as blank , then in the select statement using " IN S_lifnr " gives a dump as it treats the field as blank .( does not function as standard) . does this have anything to do with the custom search help .
any help would be appreciated .

Do you mean that u created a custom cearch help using se11 and attached that using F4IF_INT_TABLE_VALUE_REQUEST.
I dont think that is possible.
F4IF_INT_TABLE_VALUE_REQUEST is used to programmatically create an f4 help, fetching data from an internal table.
here is an eg.
DATA: BEGIN OF VALUE_ITAB OCCURS 0,
      moldno TYPE zqmrr-zzmoldno,
      END OF VALUE_ITAB.
DATA: FIELD_TAB LIKE DFIES OCCURS 0 WITH HEADER LINE.
DATA: RETURN_TAB LIKE DDSHRETVAL OCCURS 0 WITH HEADER LINE.
select-options :           s_moldno for zqmrr-zzmoldno,
AT SELECTION-SCREEN ON VALUE-REQUEST FOR S_MOLDNO-LOW.
REFRESH VALUE_ITAB[].
REFRESH FIELD_TAB[].
REFRESH RETURN_TAB[].
SELECT ZZMOLDNO FROM ZQMRR INTO table VALUE_ITAB.
FIELD_TAB-FIELDNAME = 'ZZMOLDNO'.
FIELD_TAB-TABNAME   = 'ZQMRR'.
APPEND FIELD_TAB.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
   DDIC_STRUCTURE         = ' '
      RETFIELD               = FIELD_TAB-FIELDNAME
    TABLES
      VALUE_TAB              = VALUE_ITAB
     FIELD_TAB              = FIELD_TAB
     RETURN_TAB             = RETURN_TAB
   DYNPFLD_MAPPING        =
EXCEPTIONS
   PARAMETER_ERROR        = 1
   NO_VALUES_FOUND        = 2
   OTHERS                 = 3
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
IF SY-SUBRC = 0.
    S_MOLDNO-LOW = RETURN_TAB-FIELDVAL.
ENDIF.
compare and try to find what u are doing wrong,

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Hi All,
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thank you,
Anu.

Thank You All.
Solved my self.
The coding as below.
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Hi,
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hi,
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Go through this urls.
www.****************
www.sap-img.com
Check the below links.
http://www.planetsap.com/howdo_a.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/9f/dbac5135c111d1829f0000e829fbfe/content.htm
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Hello,
Think that this is useful for u/
SELECTION-SCREEN - Defining selection screens
Variants:
1a. SELECTION-SCREEN BEGIN OF SCREEN scr.
1b. SELECTION-SCREEN END OF SCREEN scr.
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Hi all,
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now when f4 is pressed on the above sector field, this sector table has to be called so that I can select the required sector from the f4.
I am able to do till above.
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regards,
srinivas

Hi
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or
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global variable
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in your PBO
if variable is not initial.
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endif.
clear Variable.
in POV
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Regards
Edited by: Anesht on Sep 30, 2010 5:56 PM

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hi..
check the demo program is defined in the ABAP program like a normal PAI module. The processing logic of the module must ensure that adequate help is displayed for the field in question. Instead of calling an extra screen with text fields, you should use one of the following function modules to display a suitable SAPscript document:
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