1. Introduction:
User exits (Function module exits) are exits developed by SAP. The exit is implemented as a call to a function module. The code for the function module is written by the developer.
You are not writing the code directly in the function module, but in the including is implemented in the function module.
The naming standard of function modules for function module exits is: EXIT_<program name><3 digit suffix>.
The call to a function module exit is implemented as:
CALL CUSTOMER.-FUNCTION ❤ digit suffix>
Example:
The program for transaction VA01 Create sales order is SAPMV45A
If you search for CALL CUSTOMER-FUNCTION program
SAPMV45A you will find (Among other user exits):
Example:
The exit calls function module EXIT_SAPMV45A_003
exporting
xvbak = vbak
xvbuk = vbuk
xkomk = tkomk
importing
lvf_subrc = lvf_subrc
tables
xvbfa = xvbfa
xvbap = xvbap
xvbup = xvbup.
2. How to find user exits?
If you know the Exit name, go to transaction CMOD.
Choose menu Utilities->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.
Example:
Using Project management of SAP Enhancements, we want to create a project to enhance transaction 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 = ‘9999’.
Activate the include program. Go back to CMOD and activate the project.
Go to transaction VA01 and create a sales order.
Note that Sold-to-party now automatically is “9999”
learn sap erp 