Hi,
There are three methods for BDC:
1. Session methon
2. Call transaction method
3. Dialog method : this is oblolete method now so not considered.
In general, Session method is slow but consistent and used for huge data upload. Call transction method is fast but will not perform as consitant as session method for huge data upload.
Also see few differences as follows:
Session method.
1) synchronous processing.
2) can tranfer large amount of data.
3) processing is slower.
4) error log is created
5) data is not updated until session is processed.
Call transaction.
1) asynchronous processing
2) can transfer small amount of data
3) processing is faster.
4) errors need to be handled explicitly
5) data is updated automatically
Session method is to populate the data by filling BDC structure and keep as session to process from SM37 to post in appropriate Transaction.
Call transaction method is to post the data directly into the Transaction from an Executable program.
Session method SAP defined Function modules. in session method, no sy-subrc is returned due to the basic characteristic of session method. 'Call transaction' always returns Sy-subrc.
Hope this will help you.
Jogdand M B
Bluesky
