BADI ME21N

Question

Hello All,
           I read the correspondance on BADI posted by Kripa and answers by all, I also want to learn BADI.
Kripa, can you send me the BADI code & how you write methods along with the technical specifications.
My ID : [email protected]
Thanks & Regards,
Dilip
Regards,
Dilip
Message was edited by: Diliip Gupchup

Answer 1

Business Add-Ins
Overview
BAdi Definition
BAdi Implementation
Calling BAdi
Filter Dependent Badi
New SAP enhancement technique
To accommodate user requirements not available / too specific to be included in the SAP standard Program
Based on ABAP Objects – It has Interfaces & Methods
Guaranteed 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
Though different enhancement technique, BAdi has following distinct features
-Uses Object oriented approach
-Two parts - Definition and its Implementation - definition can either be SAP provided or user may also create it
-no longer assumes a two-system infrastructure (SAP and customers)
-allows multiple levels of software development (by SAP, partners, and customers, and as country versions, industry solutions, and the like)
-Can have multiple representations – specific one will be executed based on some criteria (filter)
-No SSCR registration
Application Programmer defines an interface for the Business Add-Ins
Enhancement management takes this interface & generates an adapter class for implementing it, thus opening path for implementation
As per need, BAdi is suitably implemented
Developer then creates an instance of the adapter class in the application program and calls the corresponding method at the appropriate time
Application program simply calls the adapter class methods; it does not know which implementations are actually being called
Adapter class methods generated by add-in management decide which implementation is to be called
Look for BAdi in IMG and in component hierarchy
Create own implementation of the add-in (complete coding for Methods) and activate
Enhancement's active components are called at runtime.
BAdi Definition
To include Business Add-Ins in the program
- Define an interface for the enhancement in the SAP menu under Tools-> ABAP Workbench -> Utilities -> Business Add-Ins (transaction SE18)
-Call the interface at the appropriate point in application program
-Customers can then select the add-in and implement it according to their needs
Let’s plan a simple task:
We want to convert strings in your application program is a specific way through Business Add-Ins technique
As the application developer, first task is to define an enhancement consisting of an interface & a method with a changing parameter to transfer value
Choose Tools ->ABAP Workbench -> Utilities -> Business Add-Ins (transaction SE18) from the SAP menu
Create a new Business Add-In containing a maximum of 20 characters and move to Interface Tab
Name of the interface is proposed by the system but may be changed
Save and double-click on the interface name to add a method
System branches to the Class Builder
Assign a method to the interface (default is Instance Method)
Add a parameter
Save and Activate
Definition screen(SE18) will now contain the method assigned to the interface
Documentation may be created to describe the intended functionality of this Add-Ins
BAdi Implementation
ABAP Workbench ->Utilities -> Business Add-Ins (transaction SE19)
Find the suitable Business Add-Ins present in system (Use IMG or Component hierarchy)
Use Add-Ins Documentation to understand functionality & to decide
Implement the Add-Ins
-a class is created with the same interface
-Finalize coding for the method
Implementations are discrete transport objects and lie within the namespace of the person or organization implementing them
Work on Simple Badi project – Continued…
Already structure of the interface defined
In order to create an implementation for the text conversion example, the add-in (in this case, the interface's method) needs to be filled with logic that converts the string. This logic will be run through every time the add-in is called from the application program
Choose ABAP Workbench ->Utilities -> Business Add-Ins (transaction SE19)
Create a new implementation and select the appropriate definition in the dialog box
Add a short text and move to Interface tab
Save
Double-click the method name when the system will take you to the code window for the method
Insert the desired source code for the implementation between the method if_ex_businessaddin~method. and endmethod. statements automatically provided to you by the system.
Save and return to the Change Implementation screen
On Activation, this implementation may be executed from the application program
Sample code to call Add-In from ABAP Program
To call static method of a global class directly, class … definition load statement is needed
Instance of the Adapter class is created and its method is executed
If enhancement needs to be different based on some parameter (e.g. country-specific or company-code specific), separate implementation of the same Add-In can be created and activated
At run time, the specific implementation will be execute
Possible through Filter-Dependent Badi
How it works
-Switch on Filter-dependency while defining the interface
-Select a suitable filter element
-All methods created in the interface will have filter 'FLT_VAL' as one import parameter
-Application program provides the filter value to the enhancement method
-The method then selects the active implementation for that value
What qualifies as a Filter
A Data element
Underlying domain may contain a maximum of 30 characters and must be of Character type
The data element must
-Either have a search help with a search help parameter of the same type as the data element and this parameter must serve as both the import and export parameter or
-the element's domain must have fixed domain values or a value table containing a column with the same type as the data element
Custom data element with the criteria may also be used
Implementing a Filter-Dependent Business Add-In
Implement the Add-In for each relevant filter value
However, multiple filter values may use the same implementation
Enter a characteristic filter value for the implementation
Calling a Filter-Dependent Business Add-In
Same as before
Pass the filter value as export parameter to the method
BAdi – some useful information
There can be more than one implementations of the same BADI definition, and in that case only the active implementations will be executed
You can activate or de-activate any of the implementations after creation
Enhancement, interface, and associated classes generated all lie in the appropriate application development namespace
Business Add-In implementations lie in the respective namespaces of the people who created them
Changes made to the interface and changes made to the Business-Add-In definition are always incompatible
-If implementations already exist for a Business-Add-In definition, they are invalidated if you make changes to the interface. This means that their syntax is no longer correct. No statements can be given on the runtime behavior. Avoid making changes to the interface or the Business-Add-In definition after the transport has taken place.
-If changes to the interface are inevitable, navigate to the Class Builder for all implementing classes and clean up the method includes of these classes (Utilities > Clean up > Method includes)
Thanks,