F4IF_FIELD_VALUE_REQUEST for internal table ?

Hi,
I have an internal table with field ORDERNO. How do I use in this FM to get data?
I am not able to get any F4 help though I have given all values.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      retfield                 = 'ORDERNO'
      dynpprog             = 'ZTEST'
      dynpnr                 = '1010'
      dynprofield           = 'S_ord-LOW'
     TABLES
      value_tab              = orders
     EXCEPTIONS
      parameter_error = 1
      NO_VALUES_FOUND = 2
      others          = 3.
any help?
regards,
ashish
P.S.: Points will be rewarded

Hi Ashish,
Where you call this FM.
You should call this FM under PROCESS ON VALUE-REQUEST
Check this Sample Code,
PROCESS ON VALUE-REQUEST.
FIELD D0200_FIELD_TAB-BUFFER MODULE D0200_VALUE_REQU.
MODULE d0200_value_requ.
"call the FM here.
      CALL FUNCTION 'F4IF_FIELD_VALUE_REQUEST'
           EXPORTING
               tabname             = tabname
               fieldname           = fname
           SEARCHHELP          = ' '
           SHLPPARAM           = ' '
           dynpprog            = progname
           dynpnr              = dynnr
           dynprofield         = ' '
           stepl               = dynp_stepl
               value               = value_bef_f4
           MULTIPLE_CHOICE     = ' '
           DISPLAY             = ' '
           SUPPRESS_RECORDLIST = ' '
               callback_program    = progname
               callback_form       = 'CALLBACK_F4'
          TABLES
               return_tab          = return_tab
          EXCEPTIONS
               field_not_found     = 1
               no_help_for_field   = 2
               inconsistent_help   = 3
               no_values_found     = 4
               OTHERS              = 5.
ENDMODULE.                    "d0200_value_requ
Thanks,
Reward If Helpful.

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