A Short Tutorial on User Exits

User exits :

1. Introduction
2. How to find user exits
3. Using Project management of SAP Enhancements 

Content Author: Abhishek

1. Introduction:

User exits (Function module exits) are exits developed by SAP. The exit is implementerd as a call to a functionmodule. The code for the function module is writeen by the developer. You are not writing the code directly in the function module, but in the include that is implemented in the function module.

The naming standard of function modules for functionmodule exits is: 
EXIT_<program name><3 digit suffix> 

The call to a functionmodule exit is implemented as:
CALL CUSTOMER.-FUNCTION <3 digit suffix>

Example:

The program for transaction VA01 Create salesorder is SAPMV45A

If you search for CALL CUSTOMER-FUNCTION i program
SAPMV45A you will find ( Among other user exits):

CALL CUSTOMER-FUNCTION '003'
  exporting
    xvbak   = vbak
    xvbuk   = vbuk
    xkomk   = tkomk
  importing
    lvf_subrc = lvf_subrc
  tables
    xvbfa = xvbfa
    xvbap = xvbap
    xvbup = xvbup.

The exit calls function module EXIT_SAPMV45A_003

2. How to find user exits?

Display the program where you are searching for and exit and search for CALL CUSTOMER-EXIT

If you know the Exit name, go to transaction CMOD.

Choose menu Utillities->SAP Enhancements. Enter the exit name and press enter.

You will now come to a screen that shows the function module exits for the exit.

3. Using Project management of SAP Enhancements, we want to create a project to enahance trasnaction VA01 .

- Go to transaction CMOD
- Create a project called ZVA01
- Choose the Enhancement assign radio button and press the Change button

In the first column enter V45A0002 Predefine sold-to party in sales document. 

Note that an enhancement can only be used in 1 project. If the enhancement is already in use, and error message will be displayed

Press Save

Press Components. You can now see that enhancement uses user exit EXIT_SAPMV45A_002. Double click on the exit.

Now the function module is displayed. Double click on include ZXVVAU04 in the function module

Insert the following code into the include: E_KUNNR = '2155'.

Activate the include program. Go back to CMOD and activate the project. 

Goto transaction VA01 and craete a salesorder. 

Note that Sold-to-party now automatically is "2155"

A program to help find the user exits of a transaction quickly
Finding the user-exits of a SAP transaction code

FAQ on User Exits
Field exits (SMOD/CMOD) Questions and Answers

Get help for your ABAP problems
Do you have a ABAP Question?

ABAP Books
ABAP Certification, Interview Questions, SAPscripts, Smartforms and ABAP Programming Reference Books

ABAP Tips
ABAP Forum for Discussion and Samples Program Codes for Abapers

Main Index
SAP ERP Modules, Basis, ABAP and Other IMG Stuff

All the site contents are Copyright © www.erpgreat.com and the content authors. All rights reserved.
All product names are trademarks of their respective companies.  The site www.erpgreat.com is in no way affiliated with SAP AG. 
Every effort is made to ensure the content integrity.  Information used on this site is at your own risk. 
 The content on this site may not be reproduced or redistributed without the express written permission of 
www.erpgreat.com or the content authors.