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This section explains how you can use customer exits to add your own functionality to standard R/3applications.

Enhancements to the SAP Standard with Customer Exits

Types of Exits

Locating Applications that Have Exits

Creating an Add-on Project

Activating and Deactivating a ProjectTransporting Add-on Projects

Creating Customer-specific Menus

Creating Customer-specific Subscreens

Creating Customer-specific Function Modules

More information on this subject can be found in the online help of the Project managementscreen for SAP enhancements.

Enhancements to the SAP

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The R/3 enhancement concept allows you to add your own functionality to SAPs standard businessapplications without having to modify the original applications. SAP creates customer exits for specificprograms, screens, and menus within standard R/3 applications. These exits do not contain anyfunctionality. Instead, the customer exits act as hooks. You can hang your own add-on functionality ontothese hooks.

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If you want to enhance the functionality of your SAP System, you should take advantage of the exitsavailable in standard R/3 applications. There are two main reasons why you should use exits rather thanmodifying SAP software yourself. Add-ons attached to exits have the advantage that:

They do not affect standard SAP source code

When you add new functionality to your SAP System using SAPs exits, you do not alter the sourcecode of standard SAP programs in any way. The code and screens you create are encapsulated asseparate objects. These customer objects are linked to standard applications, but exist separatelyfrom SAPs standard software package.

They do not affect software updates

When you add new functionality to your SAP System using SAPs exits, your objects (called customerobjects) must adhere to strict naming conventions. When it comes time to upgrade a to a newsoftware release, customer objects names ensure that they will not be affected by any changes ornew additions to the standard software package.

Customer exits are not available for all programs and screens found in the SAP System. You can onlyuse customer exits if they already exist in the SAP System. You find find more information about locatingapplications with pre-defined exits in Locating Applications that Have Exits.

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