Input field problem.

hi i have a problem with the input fiield.
below is my codes.
MODULE F4_INPUT INPUT.
  TYPES: BEGIN OF VALUES,
    TABNAME TYPE DD02T-TABNAME,
  END OF VALUES.
  DATA: F4_VALUES TYPE TABLE OF VALUES.
  PROGNAME = SY-REPID.
  DYNNUM = SY-DYNNR.
  SELECT DISTINCT TABNAME FROM DD02T
    INTO TABLE F4_VALUES WHERE TABNAME = IO_TABLEA.
  CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      RETFIELD    = 'IO_TABLEA'
      DYNPPROG    = PROGNAME
      DYNPNR      = DYNNUM
      DYNPROFIELD = 'IO_TABLEA'
      VALUE_ORG   = 'S'
    TABLES
      VALUE_TAB   = F4_VALUES.
ENDMODULE.              
I couldn't get the user input in (IO_TABLEA).
can anyone help me with this problem.

hi,
Check this out
http://www.sap-img.com/abap/value-request-for-parameter.htm
Regards,
Santosh

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