根据事务代码找User exit

TABLES : tstc,     "SAP Transaction Codes(SAP 事务代码)
         tadir,    "Directory of Repository Objects(资源库对象的目录)
         modsapt,  "SAP Enhancements - Short Texts(SAP增强-短文件)
         modact,   "Modifications(修正)
         trdir,    "System table TRDIR(系统表 TRDIR)
         tfdir,    "Function Module(功能模块)
         enlfdir,  "Additional Attributes for Function Modules(功能模块的附加属性)
         tstct.    "Transaction Code Texts(事务代码文本)

DATA : jtab LIKE tadir OCCURS 0 WITH HEADER LINE.
DATA : field1(30).
DATA : v_devclass LIKE tadir-devclass.

SELECTION-SCREEN BEGIN OF BLOCK a01 WITH FRAME TITLE text-001.
SELECTION-SCREEN SKIP.
PARAMETERS : p_tcode LIKE tstc-tcode OBLIGATORY.
SELECTION-SCREEN SKIP.
SELECTION-SCREEN END OF BLOCK a01.

START-OF-SELECTION.
  SELECT SINGLE * FROM tstc WHERE tcode EQ p_tcode.
  IF sy-subrc EQ 0.
    SELECT SINGLE * FROM tadir
       WHERE pgmid    = 'R3TR'
         AND object   = 'PROG'
         AND obj_name = tstc-pgmna.

    MOVE : tadir-devclass TO v_devclass.
    IF sy-subrc NE 0.
      SELECT SINGLE * FROM trdir
         WHERE name = tstc-pgmna.
      IF trdir-subc EQ 'F'.
        SELECT SINGLE * FROM tfdir
          WHERE pname = tstc-pgmna.
        SELECT SINGLE * FROM enlfdir
          WHERE funcname = tfdir-funcname.
        SELECT SINGLE * FROM tadir
          WHERE pgmid    = 'R3TR'
            AND object   = 'FUGR'
            AND obj_name = enlfdir-area.
        MOVE : tadir-devclass TO v_devclass.
      ENDIF.
    ENDIF.

    SELECT * FROM tadir
      INTO TABLE jtab
      WHERE pgmid    = 'R3TR'
        AND object   = 'SMOD'
        AND devclass = v_devclass.
    SELECT SINGLE * FROM tstct
      WHERE sprsl EQ sy-langu
        AND tcode EQ p_tcode.

    FORMAT COLOR COL_POSITIVE INTENSIFIED OFF.
    WRITE:/(12) '事务代码 - ',
    13(20) p_tcode,
    34(10) '功能 - ' ,
    45(50) tstct-ttext.
    SKIP.
    IF NOT jtab[] IS INITIAL.
      WRITE:/(95) sy-uline.
      FORMAT COLOR COL_HEADING INTENSIFIED ON.
      WRITE:/1 sy-vline,
      2 'Exit Name',
      21 sy-vline ,
      22 'Description',
      95 sy-vline.
      WRITE:/(95) sy-uline.

      LOOP AT jtab.
        SELECT SINGLE * FROM modsapt
        WHERE sprsl = sy-langu AND
        name = jtab-obj_name.
        FORMAT COLOR COL_NORMAL INTENSIFIED OFF.
        WRITE:/1 sy-vline,
        2 jtab-obj_name HOTSPOT ON,
        21 sy-vline ,
        22 modsapt-modtext,
        95 sy-vline.
      ENDLOOP.

      WRITE:/(95) sy-uline.
      DESCRIBE TABLE jtab.
      SKIP.
      FORMAT COLOR COL_TOTAL INTENSIFIED ON.
      WRITE:/ '用户出口数量:' , sy-tfill.
    ELSE.
      FORMAT COLOR COL_NEGATIVE INTENSIFIED ON.
      WRITE:/(95) '此TCode没有用户出口！'.
    ENDIF.
  ELSE.
    FORMAT COLOR COL_NEGATIVE INTENSIFIED ON.
    WRITE:/(95) '事务代码不存在！'.
  ENDIF.

AT LINE-SELECTION.
  GET CURSOR FIELD field1.
  CHECK field1(4) EQ 'JTAB'.
  SET PARAMETER ID 'MON' FIELD sy-lisel+1(10).
  CALL TRANSACTION 'SMOD' AND SKIP FIRST SCREEN.