on 04-22-2008 3:48 AM
Hi
I have seen a lot the terminology of USER EXIT, Can some body explain to me in detail what it means in SAP?
Hi
The R/3 enhancement concept allows you to add your own functionality to SAPs standard business applications without having to modify the original applications. SAP creates customer exits for specific programs, screens, and menus within standard R/3 applications. These exits do not contain any functionality. Instead, the customer exits act as hooks. You can hang your own add-on functionality onto these hooks.
Standard User exits or Enhancements can be viewed using TCode *SMOD & CMOD
There are several different types of customer exits. Each of these exits acts as hooks where you can attach or "hang" your own add-ons.
Menu Exits
Menu exits add items to the pulldown menus in standard SAP applications. You can use these menu items to call up your own screens or to trigger entire add-on applications.
SAP creates menu exits by defining special menu items in the Menu Painter. These special entries have function codes that begin with "+" (a plus sign). You specify the menu items text when activating the item in an add-on project.
Screen Exits
Screen exits add fields to screens in R/3 applications. SAP creates screen exits by placing special subscreen areas on a standard R/3 screen and calling a customer subscreen from the standard screens flow logic.
Function Module Exits
Function module exits add functions to R/3 applications. Function module exits play a role in both menu and screen exits. When you add a new menu item to a standard pulldown menu, you use a function module exit to define the actions that should take place once your menu is activated. Function module exits also control the data flow between standard programs and screen exit fields.
SAP application developers create function module exits by writing calls to customer functions into the source code of standard R/3 programs. These calls have the following syntax: CALL CUSTOMER-FUNCTION 001.
Thanks & Regards
Kishore
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Dear,
User Exits
Use
User exits offer you the possibility of accessing the processing of a generated application at specified locations and at specified times or events in order to incorporate customer-specific programs in standard procedures.
Programming these modules is not at all simple. For this reason only qualified application programmers with relevant SAP knowledge (ABAP) should be entrusted with the creation of user exits.
There are user exits which are assigned to the entire document (see User Exits for the Document Category), and those which are assigned to individual documentation elements (see User Exits for the Documentation Element). Each user exit is assigned to a processing event. If a customer-specific subroutine has been entered for an event, it will be called by the processing programs without further checking once the event is being processed.
You can use user exits to integrate external data processing into document processing. However, user exits are always specific to document categories, as they are integrated as an include into the processing program of each document. You can integrate external data independently of the document category using so-called External Data Modules.
User exits must be created as subroutines (FORM routines) in so-called includes. An include can contain several user exits.
When your include has already been included in the generated application, you should use the function Program ® Check ® Main Program. You can check whether the include is error-free can be checked by generating the program.
You can find further information, for example, on generally available from routines, general global variables and printing the element list, under Important Notes About User Exits.
If you use Generator Version 2, you should refer to the deviations described in Generator Version 2.
Amin
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due to the client requirement we need to do the enhancement in standard programmes so to achive this sap labs has already provided the programming code alias user exit
so this code is written between the programme of that screen and the requirement is achived
for example ifu reduce the price in already released po then system will nto block this po so to achive this u need to make use of the user exit
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