BADI and userexit differences

Question

hi,
what is the difference between userexit and Badi.
how both are used?
kindly give me a solution.
with regards
thiru

Answer 1

Hi Thirunavukarasu Sundaramoorthy  ,
USER-EXITS:
User Exit and Enhancement explained in detail .
http://sap.niraj.tripod.com/id21.html
Excellent web-site for user-exits
http://www.abaptalk.com/forum_posts.asp?TID=31&SID=3b18fa1dc8b7b9a1dbdedf36fe3bc2az&PID=56#56
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/208811b0-00b2-2910-c5ac-dd2c7c50c8e8
http://abap4.tripod.com/Other_Useful_Tips.html
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_SAP Enhancements. Enter the exit name and press enter.
You will now come to a screen that shows the function module exits for the exit.
3. Using Project management of SAP Enhancements, we want to create a project to enahance trasnaction VA01 .
- Go to transaction CMOD
- Create a project called ZVA01
- Choose the Enhancement assign radio button and press the Change button
In the first column enter V45A0002 Predefine sold-to party in sales document. 
Note that an enhancement can only be used in 1 project. If the enhancement is already in use, and error message will be displayed
Press Save
Press Components. You can now see that enhancement uses user exit EXIT_SAPMV45A_002. Double click on the exit.
Now the function module is displayed. Double click on include ZXVVAU04 in the function module
Insert the following code into the include: E_KUNNR = '2155'.
Activate the include program. Go back to CMOD and activate the project. 
Goto transaction VA01 and craete a salesorder. 
Note that Sold-to-party now automatically is "2155"
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
An example of a user exits :-
MODULE user_exit_0001 INPUT 
    CASE okcode.
        WHEN 'BACK OR EXIT'.
            CASE sy-dynnr.
                    WHEN '100'.
                         SET SCREEN 0.
                         LEAVE SCREEN.
                    WHEN '200'.
Note that you can write any code that satisfy your needs.                                                     ****
But in this case, this was wrote as a sample code for reference sake.                                    ****
And you can test it.                                                                                ****
                         SET SCREEN 100.
                         LEAVE SCREEN.
             ENDCASE.
      ENDCASE. 
Finding User Exits
Procdedure 1:
Valid up to at least SAP release 4.0B
One way to find user exits applicable for a given SAP screen. From the SE38 screen, enter the desired screen main program, and click Utilities > Find In Source Code, and "CUSTOMER-FUNCTION" as the text to search for. This will give you a list of the user exits and where they are called from for all screens in the module pool.
Note: format of ABAP statement is CALL CUSTOMER-FUNCTION '009', for example. This is the statement called by a submodule attached to the main program.
Actual related function is EXIT_SAPLCOIH_009, for example. This example refers to customer function 9 in main program SAPLCOIH. Not all user exit functions are names as such, but this is the usual format.
If you are doing data validation and want to set an error message with a field open, you must be sure that the user exit you are using is linked to a calling module in the PAI section of the screen and the field you wish to be open was in the CHAIN statement which caused the PAI module to be invoked.
If you use a customer function which was invoked by a PBO module to validate data, the "MESSAGE" statement will cause the screen to return with the desired message at the bottom, but with all screen fields closed for input.
When you make changes to the include module for a given customer function, you must regenerate the related function group before you will see the changes included in the screen behaviour.
Procdedure 2:
Need to find user exits module-wise? Suppose we want to see the available sales module user exits. Go to transaction SE81. Click on SD, then click "edit" on the menu bar and choose select subtree. Click on "information system," Open Environment node, customer exits, and enhancements. Press F8 to get all the user exits for that module. In brief: SE81->SD->Select subtree->Information System->Envir->Exit Techniques->Customers exits->enhancements->Execute(F8)
USER EXIT  (SAP Enhancement)
http://www.planetsap.com/userexit_det_1.htm
List of all USER EXIT's  (4.6c version)
http://www.planetsap.com/Userexit_List.htm
User Exits in FI/CO
http://www.ficoexpertonline.com/downloads/User%20ExitsWPedit.doc
Excellent web-site for user-exits
http://www.abaptalk.com/forum_posts.asp?TID=31&SID=3b18fa1dc8b7b9a1dbdedf36fe3bc2az&PID=56#56
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/208811b0-00b2-2910-c5ac-dd2c7c50c8e8
Enhancements,Creating a project,Assigning SAP enhancements to a project,Editing enhancement components,Activating a project
http://www.planetsap.com/userexit_main_page.htm
Find user exits with a TCode
http://www.erpgenie.com/abap/code/abap26.htm
SAP User Exits Routine
http://www.sap-basis-abap.com/sapab013.htm
ABAP Enhancement and Modifications(Enhancement Framework , Business Add-Ins ,Business Transaction Events)
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/109f5161-ee76-2910-cb99-db10b559ef4b
What is the difference between SMOD and CMOD?
http://www.sap-img.com/abap/what-is-the-difference-between-smod-and-cmod.htm
A Short Tutorial on User Exits
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
BAdi:
Procedure 1:
1) Go to the transaction SE37 to find your function module.
2) Locate the function SXV_GET_CLIF_BY_NAME.
3) Put a breakpoint there.
4) Now open a new session.
5) Go to your transaction. 6) At that time, it will stop this function.
7) Double click on the function field EXIT_NAME.
8) That will give you name of the BADI that is provided in your transaction.
Business Add-Ins
Procedure 2:
1) Goto se24 (Display class cl_exithandler)
2) Double click on the method GET_INSTANCE.
3) Put a break point at Line no.25 (CASE sy-subrc).
4) Now Execute SAP standard transaction
5) Press the required button for which you need to write an exit logic, the execution will stop at the break point.
6) Check the values of variable 'exit_name', it will give you the BADI name called at that time.
7) This way you will find all the BADIs called on click of any button in any transaction
SAP Business Add-Ins (BAdIs) are one of the most important technologies used to adapt SAP software to specific requirements. BAdIs were introduced with Release 4.6 and replace function module exits. This technology is not limited to SAP applications. BAdI calls can be integrated in customer applications. These can then be enhanced by other customer applications. In the various SAP applications, BAdI calls are implemented at places where enhancements are appropriate.Business add-ins are enhancements to the standard version of the system. 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 defines exit points in a source that allow specific industry sectors, partners, and customers to attach additional coding 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 solution, 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, country-specific versions, industry solutions, partner, customer, and so on). You can create definitions and implementations of Business Add-Ins at any level of the system landscape.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 differentiate between Add-In implementations using the filter Country or other criteria.
The enhancement technique is set up in such a way that it is possible to define interfaces for ABAP soure code, screens, GUI interfaces, and tables. These allow 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.
BADI is just an object-oriented version of user-exit. Instead of entering program code into some function module (as in customer-exit), you define some class which has to implement predefined methods and those methods are fired at predefined points just like an old user-exit. Some BADI can have multiple independent implementations which is much better for software deployment as several developers can implement the same BADI independently. BADI/UserExists are used to enhance R/3 For customer Needs.
Actually there is no transaction to find when and where the BADI
is called.
1. You can see the BADI description to find why it is called.
2. Once you implemented and activated the BADI, put some break points
in the BADI and see "where else used" option to check in what all
programs this BADI is called. In the ITS debug, when you are doing
the operation what exactly the BADI description tells, it will take
to the break points and you have to do manually debug the whole thing.
I know its bit difficult to do manual debug the whole thing, it
takes lot of time, but you have to be very patience when you are
dealing with BADI's.
Transaction SE18 is the BADI equivalent of transaction SMOD
Transaction SE19 is the BADI equivalent of transaction CMOD .
To find the BADI to be implemented and then implement this via SE19.
Check this blogs 2 find a BADI:
How To Define a New BAdI Within the Enhancement Framework (Some Basics About the BAdI,BAdI Commands in ABAP,
When to Use a BAdI?)
/people/thomas.weiss/blog/2006/04/03/how-to-define-a-new-badi-within-the-enhancement-framework--part-3-of-the-series
How to implement a BAdI And How to Use a Filter
/people/thomas.weiss/blog/2006/04/18/how-to-implement-a-badi-and-how-to-use-a-filter--part-4-of-the-series-on-the-new-enhancement-framework
Introducing Business Add-Ins
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f3202186-0601-0010-6591-b832b1a0d0de
How to implement BAdi in Enhancement Framework
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/d0456c54-0901-0010-f0b3-cd765fb99702
Business Add-Ins
http://help.sap.com/saphelp_47x200/helpdata/en/ee/a1d548892b11d295d60000e82de14a/frameset.htm
BAdI: Customer-Defined Functions in the Formula Builder
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
Difference Between BADI and User Exits
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
To Use BADI - Business Add In you need to Understand ABAP OO Interface Concept
http://www.sap-img.com/abap/business-add-in-you-need-to-understand-abap-oo-interface-concept.htm
cheers!
gyanaraj
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