如何进一步限制SELECT-OPTIONS的输入

TYPE-POOLS sscr.
TABLES : sflight.
SELECT-OPTIONS : s_carrid FOR sflight-carrid,
                s_connid FOR sflight-connid.
DATA: restrict TYPE sscr_restrict,
     optlist TYPE sscr_opt_list,
     ass TYPE sscr_ass.
INITIALIZATION.
  optlist-name = 'OBJECTKEY1'.
  optlist-options-eq = 'X'.
  optlist-options-bt = ''.
  APPEND optlist TO restrict-opt_list_tab.
  ass-kind = 'S'.
  ass-name = 'S_CARRID'.
  ass-sg_main = 'I'.
  ass-sg_addy = space.
  ass-op_main = 'OBJECTKEY1'.
  APPEND ass TO restrict-ass_tab.
 
  CLEAR optlist.
  CLEAR ass.
  optlist-name = 'OBJECTKEY2'.
  optlist-options-cp = 'X'.
  optlist-options-ge = 'X'.
  optlist-options-lt = 'X'.
  optlist-options-ne = 'X'.
  optlist-options-eq = 'X'.
  optlist-options-bt = 'X'.
  APPEND optlist TO restrict-opt_list_tab.
  ass-kind = 'S'.
  ass-name = 'S_CONNID'.
  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.
 
*NO-EXTENSION
*NO INTERVALS
 
*BT SELECT-OPTIONS: 活动范围
*CP 选项: 活动模式
*EQ 选项: 单一活动值
*GE 选项: 大于或等于
*GT 选项: 大于
*LE 选项: 小于或等于
*LT 选项: 小于
*NB SELECT-OPTIONS: 排除范围激活
*NE SELECT-OPTIONS: 单值活动除外
*NP 选项: 活动的模型除外