Restricting selection options

The function module SELECT_OPTIONS_RESTRICT can be used for restricting possible selection options and signs. By calling this function module, we can restrict the number of selection options available for a field. For more information,refer to the function module documentation.
The code was written in 4.6C.

REPORT selectoptionsrestrict.

* Author   :  Lakshmi Sunitha
* Date     :  February 19, 2003 

* Include type pool SSCR
TYPE-POOLS sscr.

TABLES :
  marc.

* defining the selection-screen
select-options :
  s_matnr for marc-matnr,
  s_werks for marc-werks.

* Define the object to be passed to the RESTRICTION parameter
DATA restrict TYPE sscr_restrict.

* Auxiliary objects for filling RESTRICT
DATA : optlist TYPE sscr_opt_list,
           ass type sscr_ass.

INITIALIZATION.

* Restricting the MATNR selection to only EQ and 'BT'.
  optlist-name = 'OBJECTKEY1'.
  optlist-options-eq = 'X'.
  optlist-options-bt = 'X'.
  APPEND optlist TO restrict-opt_list_tab.

  ass-kind = 'S'.
  ass-name = 'S_MATNR'.
  ass-sg_main = 'I'.
  ass-sg_addy = space.
  ass-op_main = 'OBJECTKEY1'.
  APPEND ass TO restrict-ass_tab.

* Restricting the WERKS selection to CP, GE, LT, NE.
  optlist-name = 'OBJECTKEY2'.
  optlist-options-cp = 'X'.
  optlist-options-ge = 'X'.
  optlist-options-lt = 'X'.
  optlist-options-ne = 'X'.
  APPEND optlist TO restrict-opt_list_tab.

  ass-kind = 'S'.
  ass-name = 'S_WERKS'.
  ass-sg_main = 'I'.
  ass-sg_addy = space.
  ass-op_main = 'OBJECTKEY2'.
  APPEND ass TO restrict-ass_tab.

  CALL FUNCTION 'SELECT_OPTIONS_RESTRICT'
   EXPORTING
    restriction                  = restrict
   EXCEPTIONS
     TOO_LATE                     = 1
     REPEATED                     = 2
     SELOPT_WITHOUT_OPTIONS       = 3
     SELOPT_WITHOUT_SIGNS         = 4
     INVALID_SIGN                 = 5
     EMPTY_OPTION_LIST            = 6
     INVALID_KIND                 = 7
     REPEATED_KIND_A              = 8
     OTHERS                       = 9
            .
  IF sy-subrc <> 0.
 MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.