Answer / sai krishna

Three types of enhancements is there.
1. User Exits. - Adding additional Functionality to standard through Sub routines.
2.Customer Exits. - Adding additional Functionality to standard through Function Modules.
3. Badis. - It is similar to Customer Exit. and this is object oriented. here we have two tcodes required for BADI definition- SE18 and BADI Implementation-SE19.

In Customer exits we have additional exits is there, Screen exit, Menu Exit, Field Exit and Function Exit.

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