一个查找增强的程序

REPORT ZTEST2013618.
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.
 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 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.