以下给出一个实例作为参考：

    REPORT ZTEST_USER_EXIT  .

    TABLES : TSTC,     "SAP Transaction Codes
    TADIR,    "Directory of Repository Objects
    MODSAPT,  "SAP Enhancements - Short Texts
    MODACT,   "Modifications
    TRDIR,    "System table TRDIR
    TFDIR,    "Function Module
    ENLFDIR,  "Additional Attributes for Function Modules
    TSTCT.    "Transaction Code Texts

    DATA : JTAB LIKE TADIR OCCURS 0 WITH HEADER LINE.
    DATA : FIELD1(30).
    DATA : V_DEVCLASS LIKE TADIR-DEVCLASS.
    PARAMETERS : P_TCODE LIKE TSTC-TCODE OBLIGATORY.

    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 EQ 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:/(19) 'Transaction Code - ',
    20(20) P_TCODE,
    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:/ 'No of Exits:' , SY-TFILL.
    ELSE.
    FORMAT COLOR COL_NEGATIVE INTENSIFIED ON.
    WRITE:/(95) 'No User Exit exists'.
    ENDIF.
    ELSE.
    FORMAT COLOR COL_NEGATIVE INTENSIFIED ON.
    WRITE:/(95) 'Transaction Code Does Not Exist'.
    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.