Any Functions can I use Search Help on VALUE-REQUEST in PAI.

Hi~!! Experts.
I want to know some functions or methods of Search Help.
I have made a ZHxxxx Search Help in SE11.
And I applied a screen field by using screen painter.
But I want to fill up the other fields, using selected value.
So I made a Module under th PROCESS On VALUE-REQUEST.
unfortunately, I can't use no more The Search that I made.
I want to using the Search Help(ZHxxxx), and I want to fill up the other fields by using that's values.
I guess some F4 functions can use Search Help. Right?
Anyone know how to deal it. Please answer me,. The program Type is Module Pool program.

Hi Insik,
Proceed as below :-
First of all declare the module below in the flow logic of your screen then create it in your main program.
You declare the module in the PROCESS ON VALUE-REQUEST.
PROCESS ON VALUE-REQUEST.
FIELD TXT_DOCNO MODULE VALUE_BELNR.
You also need to create an internal table where you wil store results of the select query fired below in the module.
Here you will get a F4 help on the filed Document Number(TXT_DOCNO) based on the field Company code (TXT_CODCO)
MODULE VALUE_BELNR INPUT.
progname = sy-repid.
dynnum = sy-dynnr.
CLEAR: field_value, dynpro_values.
field_value-fieldname = 'TXT_CODCO'.
APPEND field_value TO dynpro_values.
CALL FUNCTION 'F4IF_FIELD_VALUE_REQUEST'
EXPORTING
tabname = 'BKPF'
fieldname = 'BUKRS'
dynpprog = progname
dynpnr = dynnum
dynprofield = 'TXT_CODCO'.
CALL FUNCTION 'DYNP_VALUES_READ'
EXPORTING
dyname = progname
dynumb = dynnum
translate_to_upper = 'X'
TABLES
dynpfields = dynpro_values.
READ TABLE dynpro_values INDEX 1 INTO field_value.
SELECT BUKRS BELNR
FROM BKPF
INTO CORRESPONDING FIELDS OF TABLE it_doc1
WHERE BUKRS = field_value-fieldvalue.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'BELNR'
dynpprog = progname
dynpnr = dynnum
dynprofield = 'TXT_BELNR'
value_org = 'S'
TABLES
value_tab = it_doc1.
ENDMODULE. " VALUE_BELNR INPUT
Regards
Abhii

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Carlos, Please see the following program. It is working well in my system. The only difference is that I've implemented you function module as a subroutine instead of in a FM. You can see that it will return the selected value back to the screen field.
report zrich_0002 .
data: setname type setheader-setname.
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data: dynfields type table of dynpread with header line.
data: return type table of ddshretval with header line.
at selection-screen on value-request for p_val.
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p_val = setname.
start-of-selection.
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form f4_help.
constants: class type setclass value '0103',
 field_name type rgsbs-field value '*',
 kokrs type tka01-kokrs value 'BPPR',
 ktopl type tka01-ktopl value 'CAPI'.
call function 'K_GROUP_SELECT'
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 cruser = '*'
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 start_column = 10
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 table = 'CCSS'
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 ktopl = ktopl
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Thanks All for answers.
I mixed your solution and I find new way for my issue.
I did like this.
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