Answer / venkateswarlu

Session method:

Until unless sessions are not processed the data is not update in the database.
it Should not return any value
Error screens are stored into the error logs (SM35)
Update the records synchronous

Call Transaction method:
Update the records fastly.
It should return the value
For error records it will stored the Internal table BDCMSGCOLL
Update the Databae Both synchronous and asynchronous.

Answer / tanmoy

The Session method in BDC utilizes the Function Modules:
BDC_OPEN_GROUP
BDC_INSERT
BDC_CLOSE_GROUP
The data is present in the session is not updated in the
tables until & unless the session is processed by the
transaction SM35. It also updates the data synchronously.
It has an inbuilt error log.

Call Transaction method:
Update the records faster.
It should return the value.
For error records it will be stored in the Internal table
BDCMSGCOLL
Update the Database Both synchronously and asynchronously.

Syntax:
CALL TRANSACTION 'MM01' USING GT_BDCDATA
MODE 'E'
UPDATE gv_update
MESSAGES INTO GT_BDCMSGCOLL.

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