Top SAP ABAP Interview Questions on BAPI

Zafar Karnalkar 17:18

 

Introduction

BAPI (Business Application Programming Interface) is one of the most frequently asked topics in SAP ABAP interviews, especially for real-time projects and integrations.
In this post, we cover important SAP ABAP BAPI interview questions with simple and practical answers, useful for freshers as well as experienced consultants.

1. What is BAPI in SAP ABAP?

Answer:
BAPI stands for Business Application Programming Interface.
It is a standard SAP-provided, remote-enabled function module used to access SAP business objects like Purchase Orders, Sales Orders, Accounting Documents, etc.

BAPIs ensure that SAP business rules, validations, and authorizations are followed.

2. Why should we use BAPI instead of direct table updates?

Answer:
Direct table updates can cause data inconsistency and system corruption.

BAPIs are preferred because:

  • They follow standard SAP logic

  • They are upgrade safe

  • They perform validations automatically

  • They maintain data integrity

3. Are all BAPIs remote-enabled?

Answer:
Yes, all BAPIs are remote-enabled function modules, which means they can be called:

  • From other SAP systems

  • From non-SAP systems

  • Via RFC, Web services, or APIs

4. How do you find a BAPI in SAP?

Answer:
You can find BAPIs using:

  • Transaction BAPI

  • Transaction SE37 (search with BAPI*)

  • SAP Object Browser (SWO1)

  • SAP documentation and Google

5. Which BAPI is used to post accounting documents?

Answer:

BAPI_ACC_DOCUMENT_POST

This BAPI is used to post accounting documents such as:

  • GL postings

  • Vendor invoices

  • Customer invoices

  • Tax and withholding tax postings

6. What is the use of BAPI_TRANSACTION_COMMIT?

Answer:
After calling a BAPI that creates or changes data, we must call:

BAPI_TRANSACTION_COMMIT

This ensures that the data is permanently saved in the database.

Without this, the data will not be committed.

7. What happens if we do not call BAPI_TRANSACTION_COMMIT?

Answer:
If BAPI_TRANSACTION_COMMIT is not called:

  • Data will not be saved

  • Document number will not be generated

  • Changes will be rolled back

8. How do you handle errors in BAPI?

Answer:
BAPIs return messages in a RETURN parameter (usually of type BAPIRET2).

We check:

  • TYPE = 'E' → Error

  • TYPE = 'A' → Abort

  • TYPE = 'S' → Success

If errors exist, we do not call COMMIT.

9. Can we update SAP tables directly if BAPI is not available?

Answer:
No, direct updates are not recommended.
If no BAPI exists, alternatives include:

  • Standard SAP transactions via BDC

  • Enhancement frameworks (BAdI, User Exit)

  • Custom function modules using standard logic

10. What is the difference between BAPI and RFC?

Answer:

Feature                                BAPI                                    RFC
SAP Standard                                  Yes                                      Can be custom
Business Logic                              Included                                            Depends
Remote Enabled                                    Yes                                                Yes
Upgrade Safe                                     Yes                                            Not always

11. Can a BAPI be called from a non-SAP system?

Answer:
Yes, BAPIs can be called from:

  • Java applications

  • Web portals

  • Mobile applications

  • Middleware systems like CPI, PI/PO

12. What is the structure used to receive messages from BAPI?

Answer:
Most BAPIs use:

BAPIRET2

This structure contains:

  • Message type

  • Message ID

  • Message number

  • Message text

Conclusion

BAPI is a core interview topic in SAP ABAP.
Understanding why, when, and how to use BAPIs with real-time scenarios will help you clear technical interviews confidently.

👉 Tip for Interviews:
Always mention COMMIT handling and RETURN message validation when answering BAPI-related questions.

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