F4 Help for Logical file

Hi All,
i've declared a parameter where end-user can specify the logical file name. can anyone provide the code for F4 help for logical file name.
Regards
Faisal

Declare this :-->
PARAMETERS: p_apsvr LIKE rlgrap-filename OBLIGATORY.
AT selection Screen
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_apsvr.
PERFORM get_apsvr_path.
FORM get_apsvr_path .
CALL FUNCTION '/SAPDMC/LSM_F4_SERVER_FILE'
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      filemask         = '*'
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      canceled_by_user = 1
      OTHERS           = 2.
IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE 'S' NUMBER sy-msgno
              WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
ENDFORM.                    " get_apsvr_path

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Message was edited by: Anurag Bankley
Message was edited by: Anurag Bankley

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