Friday, December 14, 2012

Important ABAP Questions Usually Missed Out!

Hi folks! Below are some of the questions that I encountered during my interviews. It is very hard to face the interviewer if you do not know how to answer those questions as they appear as basic. So, what I did, was to write down what I have remembered and add them on this list.

NOTE: Don't forget to memorize all the important FMs used in ABAP development.

1. What is needed to add a custom field to a standard table. -custom includes staring in CI or append structure button

2. What is the type needed for a table field to accept a negative and positive symbol and what are the steps.
- The data type of integers, i, has a value range of -2147483648 to +2147483647 and contains integers only. You can specify integers as numeric literals directly in the program.

3. Difference between a BAPI and FM. - bapi is stored in bor, remote enabled, pre-defined standard processes from SAP while standard FM is the opposite.

4. Difference between a BAPI and RFC. -BAPI in BOR and call standard sap process while RFC is the gateway to call a remote-enabled FM like BAPI.

5. The different kind of exits.
- menu exits
- screen exits
- FM exits
- field exits

6. Steps in creating a BADI
- you need to put a break point inside class ‘CL_EXITHANDLER’


of method get_instance

SE19 you will create a new copy of badi method you have detected (starting in Z) or in oop concept you will redefine(polymorphism) it. Then, in SE18, there you will see the actual coding of the method you are copying. In there you can copy paste the FM being called by the standard method and put it on your redefined badi method.

**Advantage of BADI**

The main advantage of this concept is the capacity for reuse. Once implemented, a Business Add-In
can be reimplemented by other links in the software chain**TAW10

7. Difference between a BADI and user exits.
- badi is more of OOP while user exits are the usual abap exit using FMs.

8. How to convert Smartforms/Sapscript to PDF
- get the otf file
- convert the otf file to pdf by using a certain FM
- then call an FM to download the file

9. How to format a currency using WRITE in classic list.
set country 'US' or character. If 'US' or any character the represents it is blank, then it will used what it is defined in master record or sap sytem config, otherwise it will search the one in t005x table.
set currency will override set country

10. Difference between layout and fieldcat setup in ALV.
-layout, will affect the whole alv functionality
- fieldcat for each specific field

11. How to read file and what is the FM used.

12. Difference between a GUI download and OPEN Dataset FMs.

GUI_DOWNLOAD - download file to local/presentation server, while OPEN Dataset from applicaiton server.

Running ABAP Program in batch mode is capable only of handling file from application server thus the abap statement below are the only means for you to handle data transfer running in batch mode:


13. What are the sample BAPIs.
- BAPI_fixedasset_create1

14. Define field-symbols.
- placeholder to a certain variable. they do not reserve space but pointing the variable value to it after referencing.

15. Logical DB advantage and disadvantage.
Advantage: Centralized authorization check, Own pre-defined selection screen, Faster retrieval of data through its hierarchal design
Event of logical DB is get. It invokes the pull event handler in LDB program (created in SE36)
Event get late - is performed after all the tables in the lower part of the hierarchy have been processed

16. How to create text fields.

17. How to create a text table - Create ID table then the Text Table by linking their keys by making it foreign.

18. What are the implications of mandt - client dependecy such that if not included in a table, data is visible across boxes/clients.
- usually not including mandt is used in SAP system tables wherein that table data will be used accross clients

19. Ways to add data to a database tabale
- modify, will update the data, if not found it will insert the data
- update - it will only update existing data otherwise error
- insert - add the new record which is not existing, otherwise error

20. Ways to add data to abap internal table
21. Types of SAP Dialog events
-  Process Before Output (PBO) - triggered before screen is displayed

- Process After Input (PAI) - triggered after the screen is displayed
- Process On-Help Request (POH) - F1
- Process On-Value Request (POV) - F4
----------------------ADDITIONAL QUESTIONS--------------------

22. Types of ABAP tables:
- Index tables and hashed table
- Index tables are standard table and sorted table
- Hashed table is only hashed table
- Standard table can be accessed by using an index or key
- Sort table can be accessed using an index or key and sorted in ascending order by default

- ALE- Application link Enabling, enables linking between two systems
- 3 Layers of ALE are Application layer, Distribution layer, and Communication layer
   - Application layer - refers to the applicaiton data such as SD, MM, FI, HR etc
   - Distribution layer - wherein data is determined to whom it will be distributed and formatted
   - communication layer - this is where the transfer of data takes place through RFC, TCP etc

- EDI is a translator of IDOC data. Usually it is a third party component.
  - it is comprised of outbound and inbound process

IDOC - is a transporter of the data being passed to ALE. te data being hold is arranged in a structured format.

24. How SAP table handles uppercase/lowercase queries? 
 - this can be done in domain level. By default, the domain data type will convert any characters to uppercase unless the it is selected in the domain lowercase tick box.

25. SAP Memory types
 - ABAP Memory -> can be accessed by the programs within internal session using import and export parameters
 - SAP Memory -> can be accessed by different programs across external sessions using GET/SET(GPA/SPA) Parameters