Answer / kalyan

User exit,Customer exit and BADI are the enhancement techniques which are used to write your custom code with out modifying the standard application.

User Exit is subroutine where we write custom code.We need SAP Access key to write user exit. It will available for only SD module.

Customer Exit is Z include program where we write custom code.We don't need SAP Access key.

Customer exit and user exit can implement only in a single project. BADI can be implemented in multiple project.

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