初代增强
查找：se38
Z_FIND_USEREXIT
ZENHANCE_FIND 没有的话可以复制下面查找增强代码
REPORT z_find_userexit NO STANDARD PAGE HEADING.
*&---------------------------------------------------------------------*
*& Enter the transaction code that you want to search through in order
*& to find which Standard SAP User Exits exists.
*&
*&---------------------------------------------------------------------*
*&---------------------------------------------------------------------*
*& Tables
*&---------------------------------------------------------------------*
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
*&---------------------------------------------------------------------*
*& Variables
*&---------------------------------------------------------------------*
DATA : jtab LIKE tadir OCCURS 0 WITH HEADER LINE.
DATA : field1(30).
DATA : v_devclass LIKE tadir-devclass.
*&---------------------------------------------------------------------*
*& Selection Screen Parameters
*&---------------------------------------------------------------------*
SELECTION-SCREEN BEGIN OF BLOCK a01 WITH FRAME.
SELECTION-SCREEN SKIP.
PARAMETERS : p_tcode LIKE tstc-tcode OBLIGATORY.
SELECTION-SCREEN SKIP.
SELECTION-SCREEN END OF BLOCK a01.
*&---------------------------------------------------------------------*
*& Start of main program
*&---------------------------------------------------------------------*
START-OF-SELECTION.
* Validate Transaction Code
SELECT SINGLE * FROM tstc
WHERE tcode EQ p_tcode.
* Find Repository Objects for transaction code
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.
* Find SAP Modifactions
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.
* Take the user to SMOD for the Exit that was selected.
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.userExit开头的子例程 include 修改源代码
二代增强 函数增强
se37查找增强 MODX_FUNCTION_ACTIVE_CHECK
1.功能模块增强 出口以Exit_开头 数据字典 （TFDIR） 函数表
2.子屏幕增强 预留了屏幕编码
3.gui status功能增强
smod查看增强 cmod实现增强
三代增强 badi 基于面向对象 通过接口（se24）方法实现使用
se24 GET_INSTANCE
在get_instance中打断点
badi和exit的区别 exit中一个enhancement只能使用一次，badi一个接口可以被多次实现
