Restricting values in F4 help pertaining to value in other parameter field

Hello experts,
In selection-screen, i have two parameters namely BUKRS and WERKS.
Now when i enter company code in BUKRS, i want to get list of plants of that company code only, in F4 help. I don't want data of other plants which are not related to company code i enter in BUKRS. How can i do so in my program itself. I don't want to create a search help in SE11. What code should i write in AT SELECTION-SCREEN OUTPUT.??

hi,
DATA :      DYNPRO_VALUES TYPE TABLE OF DYNPREAD,"declare like this
      FIELD_VALUE LIKE LINE OF DYNPRO_VALUES.
DATA: t_return3 like ddshretval occurs 0 with header line.
CLEAR: FIELD_VALUE, DYNPRO_VALUES.
REFRESH DYNPRO_VALUES.CLEAR FIELD_VALUE.
FIELD_VALUE-FIELDNAME = 'BUKRS'.
APPEND FIELD_VALUE TO DYNPRO_VALUES.
CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      DYNAME             = SY-CPROG
      DYNUMB             = SY-DYNNR
      TRANSLATE_TO_UPPER = 'X'
    TABLES
      DYNPFIELDS         = DYNPRO_VALUES.
READ TABLE DYNPRO_VALUES INDEX 1 INTO FIELD_VALUE.
SELECT DISTINCT werks FROM Tt001w into table itab where bukrs = FIELD_VALUE-FIELDVALUE.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      RETFIELD    = 'WERKS'
      DYNPPROG    = SY-REPID
      DYNPNR      = SY-DYNNR
      DYNPROFIELD = 'WERKS'
      VALUE_ORG   = 'S'
    TABLES
      VALUE_TAB   = ITAB
      RETURN_TAB = t_return3."will contain the selected values
regards,
syed

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