Help Regarding Exits

Question

Hi, Please explain me the uses of User Exits?
and where we have to create them?
What are types of Exits?
Thanks
Please explain me
thanks and regards
Dinakar

Answer 1

MODIFICATIONS : Change to the standard functionality by changing the SAP object itself using the 'ACCESS KEY ' from SAP .
These objects needs to be observed during version upgrades as the upgrade patches might overwrite the code written by you .
Except for certain incode user exits provided by SAP like MV45AFZZ .
ENHANCEMENTS : Change to the standard functionality by using the exits / badis provided by SAP.
These objects do not need any access key from SAP.
These changes will not get over written during SAP version upgrades.
MODIFICATIONS : Change to the standard functionality by changing the SAP object itself using the 'ACCESS KEY ' from SAP .
These objects needs to be observed during version upgrades as the upgrade patches might overwrite the code written by you .
Except for certain incode user exits provided by SAP like MV45AFZZ .
ENHANCEMENTS : Change to the standard functionality by using the exits / badis provided by SAP.
These objects do not need any access key from SAP. These changes will not get over written during SAP version upgrades.
USER EXITS->
1. Introduction:
User exits (Function module exits) are exits developed by SAP.
The exit is implementerd as a call to a functionmodule.
The code for the function module is writeen by the developer.
You are not writing the code directly in the function module,
but in the include that is implemented in the function module.
The naming standard of function modules for functionmodule exits is:
EXIT_<program name><3 digit suffix>
The call to a functionmodule exit is implemented as:
CALL CUSTOMER.-FUNCTION <3 digit suffix>
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
CUSTOMER EXITS-> t-code CMOD.
As of Release 4.6A SAP provides a new enhancement technique, the Business Add-Ins.
Among others, this enhancement technique has the advantage of
being based on a multi-level system landscape (SAP, country versions, IS solutions, partner,
customer, and so on)
instead of a two-level landscape (SAP, customer) as with the customer exits.
You can create definitions and implementations of business add-ins at any level of the system landscape.
To unify enhancements of the SAP Standard you can migrate customer exits to business add-ins.
http://help.sap.com/saphelp_nw04/helpdata/en/c8/1975cc43b111d1896f0000e8322d00/content.htm
In order to find out the user exits for any tcode,
1. get the developement class of the tcode from SE93.
2. Now goto transaction SMOD and press F4,
3. give in the Deve class in the dev class and Press ENTER
this will show u the exits for any tcode.
or execute this report
http://www.erpgenie.com/sap/abap/code/abap26.htm
which gives the list of exits for a tcode
http://help.sap.com/saphelp_nw04/helpdata/en/bf/ec079f5db911d295ae0000e82de14a/frameset.htm
For information on Exits, check these links
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sapgenie.com/abap/code/abap26.htm
http://www.sap-img.com/abap/what-is-user-exits.htm
http://wiki.ittoolbox.com/index.php/HOWTO:Implement_a_screen_exit_to_a_standard_SAP_transaction
http://www.easymarketplace.de/userexit.php
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sappoint.com/abap/userexit.pdfUser-Exit
Difference between user exits & customer exits:
User exit - A user exit is a three character code that instructs the system to access a program during system processing.
SXX: S is for standard exits that are delivered by SAP. XX represents the 2-digit exit number.
UXX: U is for user exits that are defined by the user. XX represents the 2-digit exit number
Customer exit - The R/3 enhancement concept allows you to add your own functionality to SAP’s 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.
"The R/3 enhancement concept allows you to add your own functionality to SAP’s 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."
Customer exits are implemented in Z-includes and are ENHANCEMENTS to the system.
User-exits were firstly intended to be developed for the SD module. You make your coding in includes in SAP namespace
(e.g MV*). That's why, user exits are MODIFICATIONS to the system. In includes for user exits there are empty subroutines
( generally with the name convention "userexit_...") and you code using global variables of the main program.
But, generally developers use these terms without this distinction. So, someone may mean a "customer exit" when (s)he says
"user exit" or vice-versa.
And as a last thing, let me introduce you the SDN forums pointing system: You can assign points to posts you find helpful
while solving your question. You can reward points by clicking the yellow star icon at header of each reply post.
You can reward;
Business Add-Ins are a new SAP enhancement technique based on ABAP Objects. They can be inserted into the SAP System to
accommodate user requirements too specific to be included in the standard delivery. Since specific industries often require special functions, SAP allows you to predefine these points in your software.
As with customer exits two different views are available:
In the definition view, an application programmer predefines exit points in a source that allow specific industry sectors,
partners, and customers to attach additional software to standard SAP source code without having to modify the original
object.
In the implementation view, the users of Business Add-Ins can customize the logic they need or use a standard logic if one
is available.
In contrast to customer exits, Business Add-Ins no longer assume a two-level infrastructure (SAP and customer solutions),
but instead allow for a multi-level system landscape (SAP, partner, and customer solutions, as well as country versions,
industry solutions, and the like). Definitions and implementations of Business Add-Ins can be created at each level within
such a system infrastructure.
SAP guarantees the upward compatibility of all Business Add-In interfaces. Release upgrades do not affect enhancement calls
from within the standard software nor do they affect the validity of call interfaces. You do not have to register
Business Add-Ins in SSCR.
The Business Add-In enhancement technique differentiates between enhancements that can only be implemented once and
enhancements that can be used actively by any number of customers at the same time. In addition, Business Add-Ins can
be defined according to filter values. This allows you to control add-in implementation and make it dependent on specific
criteria (on a specific Country value, for example).
All ABAP sources, screens, GUIs, and table interfaces created using this enhancement technique are defined in a manner
that allows customers to include their own enhancements in the standard. A single Business Add-In contains all of the
interfaces necessary to implement a specific task.
The actual program code is enhanced using ABAP Objects. In order to better understand the programming techniques behind
the Business Add-In enhancement concept, SAP recommends reading the section on ABAP Objects.
Difference between user exits & customer exits:
User exit - A user exit is a three character code that instructs the system to access a program during system processing.
SXX: S is for standard exits that are delivered by SAP. XX represents the 2-digit exit number.
UXX: U is for user exits that are defined by the user. XX represents the 2-digit exit number
Customer exit - The R/3 enhancement concept allows you to add your own functionality to SAP’s 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. *-- Mani
The following document is about exits in SAP :-
The R/3 enhancement concept allows you to add your own functionality to SAP’s standard business applications without having
to modify the original applications.
SAP creates user 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.
Customer Exit is a hook and also we have to add our own functionality so we have to write the code in include file and
activate that project in CMOD.
Whereas in User Exit ,we are writing the code in SAP namespace. So am thinking that its no need to create project and
activating that project for user exit. Is it right? For User Exit also we have to create project please clarify me
User Exits:
User exits allow you to add additional functions to the SAP standard.
Programs with user exits contain subroutine calls at certain points in their syntax that are identified by the prefix
USEREXI
T. The actual user exits are located in an include that has been assigned to a module pool. This is where customers can
include any changes (enhancements) that they want to make to the system. These includes are always processed during program
flow.
Advantage: In principle, customers can modify anything they want that is found in the include (tables, structures, and so
forth).
Disadvantage: SAP cannot check the individual enhancements themselves which often leads to errors in the enhancement process.
User exits (Function module exits) are exits developed by SAP. The exit is implemented as a call to a function module.
The code for the function module is written by the developer. You are not writing the code directly in the function module,
but in the include that is implemented in the function module.
Customer exits are not available for all programs and screens found in the SAP System. You can only use customer exits if
they already exist in the SAP System.
Customer Exit
SAP creates customer exits for specific programs, screens, and menus within standard 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.
If you want to enhance the functionality of your SAP System, you should take advantage of the exits available in
standard applications. There are two main reasons why you should use exits rather than modifying 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 SAP’s exits, you do not alter the source code of
standard SAP programs in any way. The code and screens you create are encapsulated as separate objects.
These customer objects are linked to standard applications, but exist separately from SAP’s standard software package.
• They do not affect software updates
When you add new functionality to your SAP System using SAP’s exits, your objects (called customer objects)
must adhere to
strict naming conventions. When it comes time to upgrade a to a new software release, customer objects’ names ensure that
they will not be affected by any changes or new additions to the standard software package.
Customer exits are not available for all programs and screens found in the SAP System. You can only use customer exits if
they already exist in the SAP System. You can find more information about locating applications with pre-defined exits in
Locating Applications that have Exits
1. Learn user exits :
http://www.sapgenie.com/links/abap.htm
2. finding user exits :
http://www.sapgenie.com/abap/code/abap26.htm
3. A short tutorial on user exits :
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
4. Introduction to user exits with examples :
http://www.sap-img.com/abap/what-is-user-exits.htm
Regards,
Balaji.