F4 Help on one field should populate data on another field

Dear All....
I am using the FM - F4IF_INT_TABLE_VALUE_REQUEST for F4 help on one field of the selection screen. Based on the selected value, a values corresponding to it should appear on another field.
My Code -
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_svn.
SELECT qmnum serialnr
    INTO TABLE t_qmel
    FROM qmel
    WHERE qmart = 'ZD'.
SORT t_qmel BY qmnum.
Display the f4 Help Values for SVN
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      retfield     = 'QMNUM'
      dynpprog     = sy-repid
      dynpnr       = sy-dynnr
      dynprofield = 'P_SVN'
      window_title = text-015
      value_org    = 'S'
    TABLES
      value_tab    = t_qmel
      return_tab   = t_retval.
READ TABLE t_retval INTO w_retval_wa INDEX 1.
IF sy-subrc = 0.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
      EXPORTING
        input = w_retval_wa-fieldval
      IMPORTING
        output = w_qmel_wa-qmnum.
    w_retval_wa-fieldval = w_qmel_wa-qmnum.
    READ TABLE t_qmel INTO w_qmel_wa WITH KEY qmnum = w_retval_wa-fieldval
                                     BINARY SEARCH.
    IF sy-subrc = 0.
      p_esn = w_qmel_wa-serialnr.
    ENDIF.
ENDIF.
But this is however not working.
Please let me know where I am going wrong.
I have serached SDN thoroghly but could not get my solution.
Please guide me....
Regards,
Pankaj Agarwal.

*& AT SELECTION SCREEN ON VALUE-REQUEST FOR FIELD
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_ebeln.
PERFORM f4_hlp_ebeln.
*&      Form F4_HLP_EBELN
      text
--> p1        text
<-- p2        text
FORM f4_hlp_ebeln .
TYPES: BEGIN OF ty_ebeln,
           ebeln TYPE ebeln ,
        END OF ty_ebeln.
DATA: lt_ebeln TYPE TABLE OF ty_ebeln.
CLEAR: lt_ebeln[].
SELECT ebeln
       FROM zmt_po_mic_ded
         INTO TABLE lt_ebeln.
IF sy-subrc = 0.
    SORT lt_ebeln[] BY ebeln.
    DELETE ADJACENT DUPLICATES FROM lt_ebeln COMPARING ALL FIELDS.
    CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
      EXPORTING
        retfield         = 'EBELN'
        dynpprog         = sy-repid
        dynpnr           = sy-dynnr
        dynprofield      = 'P_EBELN'
        value_org        = 'S'
        callback_program = sy-repid
      TABLES
        value_tab        = lt_ebeln[]
      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.
ENDIF.
ENDFORM.                    " F4_HLP_EBELN
DATA: t_dynfields TYPE TABLE OF dynpread,
      t_valhlp    TYPE TABLE OF ty_valhlp.
DATA: w_dynfields TYPE dynpread.
CLEAR: t_dynfields[], t_valhlp[].
DATA: l_ebeln TYPE ebeln.
w_dynfields-fieldname = 'P_EBELN'.
w_dynfields-fieldvalue = p_ebeln.
APPEND w_dynfields TO t_dynfields.
CLEAR w_dynfields.
CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      dyname               = sy-repid
      dynumb               = sy-dynnr
      translate_to_upper   = c_x
    TABLES
      dynpfields           = t_dynfields
    EXCEPTIONS
      invalid_abapworkarea = 1
      invalid_dynprofield = 2
      invalid_dynproname   = 3
      invalid_dynpronummer = 4
      invalid_request      = 5
      no_fielddescription = 6
      invalid_parameter    = 7
      undefind_error       = 8
      double_conversion    = 9
      stepl_not_found      = 10
      OTHERS               = 11.
IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
READ TABLE t_dynfields INTO w_dynfields INDEX 1.
IF sy-subrc = 0.
    l_ebeln = w_dynfields-fieldvalue.
    SELECT ebeln
           ebelp
           FROM ekpo
           INTO TABLE t_valhlp
           WHERE ebeln = l_ebeln.
    IF sy-subrc = 0.
      SORT t_valhlp[] BY ebeln ebelp.
here we get the value of ebelp depending on the selection of EBELN ***
    endif.
ENDIF.

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