User Exit serve the same purpose as Customer Exits but they are available only for the SD module. The exit is implemented as a call to a Function Module. The code is written by the developer.
Well know User Exit in SD is MV45AFZZ
USEREXIT_FIELD_MODIFICATION - To modify screen attributes
USEREXIT_SAVE_DOCUMENT - To perform operations when user hits Save
USEREXIT_SAVE_DOCUMENT_PREPARE
USEREXIT_MOVE_FIELD_TO_VBAK - When user header changes are moved to header work area.
USEREXIT_MOVE_FIELD_TO_VBAP - When user item changes are moved to SAP item work area
Disclimer: PCDS.CO.IN not responsible for any content, information, data or any feature of website.
If you are using this website then its your own responsibility to understand the content of the website