User exits in ABAP

 * User exits are modifications. we enhance the SAP functionalities in SAP namespace.

* They are only available in SAP SD module.

* They are available in the form of subroutines.

* The most important user exits related to sale order are available in program MV45AFZZ.


* X - New data.

* Y - Old data.

* Update indicator

        - I (insert).

        - U (update/change).

        - D (delete).

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