SAP uses an User Exit (SMOD/CMOD) in order to make an enhancement of customers a lot more convenient. There are very many user exits available within SAP.
When using an user exit, the system does NOT become modified what happens when you start changing SAP for your needs.
So, it is very interesting to make use of all options, that leave the SAP system as unmodified as possible. Therefore, you should always check the available user exits in the area for your needed enhancements.
You can activate user exits in the SAP transactions SMOD and CMOD. There you can check for the appropiate user exit and insert the new enhanced code in function modules for your needs.
Here you find the complete list of SAP Userexits in SAP R/3 Enterprise 4.7:
(You can find this list in your SAP system as follows:
TA CMOD -> Utilities -> SAP Enhancements -> F8 Execute)
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