What is the difference between BAPI and RFC?
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Answer Posted / firdoos
I like to describe BAPIs as "Dialog without dialog". What does this mean?
BAPIs do the same validations like in the corresponding dialog transaction, e.g. BAPI_USER_CREATE1 and SU01.
Underneath a BAPI you may find RFC-enabled function modules which may also provide the BAPI functionality (e.g. create a SAP user) yet they do not care much about validations.
Example:
BAPI_USER_CREATE1 eventually uses fm SUSR_BAPI_USER_CREATE to create a SAP user.
The function module may allow you to create the SAP user with a wrong title whereas the BAPI won't. The wrong title will cause problems in the dialog transaction (SU01).
Another important aspect is that BAPIs never raise exceptions but return the AEX-messages in a RETURN parameter (e.g. of type BAPIRET2).
Last but not least a BAPI should never do the COMMIT WORK itself but you have to do it after a successful BAPI call (e.g. by calling BAPI_TRANSACTION_COMMIT or BAPI_TRANSACTION_ROLLBACK).
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