Interview questions for enhancements in ABAP

 1. Enhancements

* Will enhance the sap functionality in customer name space.

* Customer name space-> (z or y)

2. Modifications 

* Will enhance the sap functionality in sap name space.

* Name should not start with z or y.

3. Types of enhancements

    1. Implicit and Explicit enhancements {enhancements}

    2. Customer exit. {enhancements}

    3. Badi {enhancements}

    4. User exit {modification}

4. Implicit enhancement

    * Implicit point is available at the starting or at the last of program.

    * Subroutines, function modules etc.

5. Explicit enhancement

    * Explicit point & section are available at any line.

    * Point - It will not give default implementation.

                 - You can only add additional codes, you can't replace the existing code.

    * Section - It will give default implementation

    - You can change or replace the existing code.

6. Customer Exit.

* Customer exit is an enhancement. We enhance the SAP functionality in customer namespace (Z or Y).

* There are 3 types.

        > Function module exit / Function exit.

        > Menu exit.

        > Screen exit.


Function module exit.

* It allows us to add your code to SAP programs with the help of function modules.

* Syntax: CALL CUSTOMER-FUNCTION 'three-digit number'(000 to 999).

* Example CALL CUSTOMER-FUNCTION '001'.

Menu exit.

*  Menu exit allows us to add menu items to the menu of SAP programs.

*  These menu items have function code that begins with "+"(a plus sign).

*  We can perform customer specific functionalities on these menu items.

Screen exit.

* Screen exit allows us to add fields to the screen of SAP programs with the help of customer sub screen.

* SAP provides sub screen areas within a standard screen.

* The customer sub screen is called within the standard screen flow logic.

* Syntax to call customer sub screen into standard screen - CALL CUSTOMER-SUBSCREEN 'sub screen area' including 'program name' 'customer sub screen number'.

* Example- CALL CUSTOMER-SUBSCREEN 'custscrn2' INCLUDING 'SAPLXT' '2000'.

Important points

* One customer exit can only be assigned to one project at a time.

* SMOD - Transaction code to find customer exit.

* CMOD - Transaction code to implement a customer exit.

* MODSAP - Table to find a customer exit.

* MODACT - Table to find a project for a customer exit.

7. BADI 

        - Badi is an enhancement. we enhance the sap functionalities in customer name space.

- Business add ins.

- It is based upon oops concept (Interface and classes).

- SE18 - Badi def.

- SE19 - Badi impl.

- There are 2 types on Badi

* Classic Badi - no enhancement spot - default create class.

* New Badi (kernel Badi) - have enhancement spot - give class name.


8.User exits 

* User exits are modifications. we enhance the SAP functionalities in SAP namespace.

* They are only available in SAP SD module.

* They are available in the form of subroutines.

* The most important user exits related to sale order are available in program MV45AFZZ.

* X - New data.

* Y - Old data.

* Update indicator

        - I (insert).

        - U (update/change).

        - D (delete).


9. What is enhancement spot?

* Explicit enhancement.

* Enhancement spots are containers for explicit enhancement options.


10. What is the use of SAP internal, Multiple use, Filter depend?

* SAP Internal

- It can be used by only SAP.

* Mutiple use

- Multiple use Badi can be used for multiple implementations.

- Check box is checked then it is multiple use.

- Check box is unchecked then its single use.

* Filter

- In BADI's filters give you a chance to call specific implementation based on filter value.

- Actually, it is available whenever you have multiple implementations for one BADI definition.

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