F4 help for custom table field - to be used when populating data thru SM30

Hi,
I have a custom table with 5 fields - say A, B, C, D and E. While populating data to the table through SM30, I need to create a F4 help for the field C. A  custom function module needs to be used.
I have created a module for the same in the event PROCESS ON VALUE-REQUEST of the function group of the table.
But the F4 for field C depends on the values put in fields A and B.
I am not able to get the values of fields A and B from within the module PROCESS ON VALUE-REQUEST.
Please help me to create the F4 help.

hii,
This is the piece of code i have used in one of my SM30 to get f4. mopdify according to ur need and use.
revert back for further help.
w_dynpread-fieldname = 'ZSITEDCDATA-SITE'.
  APPEND w_dynpread TO i_dynpread.
  CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      dyname               = 'SAPLZSITEDCDATA'
      dynumb               = sy-dynnr
      translate_to_upper   = 'X'
    TABLES
      dynpfields           = i_dynpread
    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 i_dynpread INTO w_dynpread INDEX 1.
  IF sy-subrc IS INITIAL.
    SELECT land1 FROM t001w
      INTO TABLE i_site
      WHERE werks EQ w_dynpread-fieldvalue.
    IF i_site[] IS NOT INITIAL.
      DATA: lv_line TYPE i.
      CLEAR lv_line.
      DESCRIBE TABLE i_site LINES lv_line.
      IF lv_line GT 1.
        CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
          EXPORTING
            retfield        = 'ZSITEDCDATA-SITE_COUNTRY'
            dynpprog        = 'SAPLZSITEDCDATA'
            dynpnr          = sy-dynnr
            window_title    = 'Site Country'
            value_org       = 'S'
          TABLES
            value_tab       = i_site[]
            return_tab      = i_return
          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.
        ELSE.
          READ TABLE i_return INTO w_return INDEX 1.
          IF sy-subrc IS INITIAL.
            zsitedcdata-site_country = w_return-fieldval.
          ENDIF.
        ENDIF.
Thanks ,
Gaurav

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