Get the line from my selection screen

Hii,
I need help. If I select a value from the value help, I also want to read the line from my itab to make changes in this line and save this line bank to the dtab. I have no idea how to get the the row from my internal table that will appear in my selection selection screen.
Could anyone give me some advices how to get the line from my selected value?
AT SELECTION-SCREEN ON VALUE-REQUEST FOR CREATION.
SELECT * FROM flight INTO TABLE lt_flight.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      retfield        = 'UPDATE_DATE'
      value_org       = 'S'
    TABLES
      value_tab       = lt_flight
      return_tab      = return_tab
IF SY-SUBRC = 0.
ENDIF.
ls_dynpro_value-fieldname = 'CREATION'.
thanks and regards,
John

Hi,
Try to pass parameter to FM like this:
call function 'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'SAKNR'
dynpprog = sy-repid
dynpnr = sy-dynnr
dynprofield = 'S_SAKNR' "dynpro field
window_title = 'AR Account'
value_org = 'S'
TABLES
value_tab = lt_skat_f4 "internal table contain values
EXCEPTIONS
parameter_error = 1
no_values_found = 2
others = 3.
Hope this help.
BR,
Thien

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