BDC Call Transaction
1. This is a synchronous processing.
2. Database update can be synchronous and asynchronous.
3. It is faster than session method.
4. Auto exception handling not possible here, we can handle the exception with the help of BDCMSGCOLL structure.
5. Suitable for 1 to 10000 data records.

BDC Session
1. This is an asynchronous processing.
2. Database update always synchronous
3. It is slower than call transaction method.
4. Auto exception handling possible here.
5. Suitable for more than 10000 records or mass of data records.

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