[ABAP] Restrict Select-Option to single values

INITIALIZATION.

  DATA: ls_restrictions TYPE sscr_restrict.

  APPEND VALUE #( name = 'CP' options-cp = abap_true ) TO ls_restrictions-opt_list_tab.

  APPEND VALUE #( kind    = 'S' name    = 'S_GRUND' sg_main = 'I'
                  sg_addy = ' ' op_main = 'CP'      op_addy = 'CP' ) TO ls_restrictions-ass_tab.

  CALL FUNCTION 'SELECT_OPTIONS_RESTRICT'
    EXPORTING
      restriction = ls_restrictions.