Answer / nsp

To the best of my knowledge, Call transaction and Session
method are used to update data base using a transaction.
but bapi calls for direct update of data base with all the
validations done inside the BAPI function module. The
validations and consistency of data is taken care by
Transactions in the case of call transaction and session
method.

Answer / abaprajaram

Interface Programs are used for BAPI
Conversions are used for BDC
Conversions are used for Both Call and Session methods
Where as Interfaces are used for the session

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