Which method of BDC is used in which condition and Why?

Hi,
I want to know In which conditions(or in which type of data) Call Transaction or Batch Input Session is used for Data Migration and why?
Please help me out.
Thanks and Regards,
Gagan Mittal

In both, you will be doing the same screen scraping. But the main difference is while Batch Input method keeps your sessions persistantly if an error occurs, whereas CALL TRANSACTION does not provide that mechanism automatically, you will have to code for it. In call transaction you calling a transaction in a loop depending on your input. But in a batch input session, you will combine your transactions into batches that can be processed at a later time or immediately. This way, when you are doing large volume loads, and you don't want to burden your system with all the transactions running, you can create batches that you can process later when the system is not over-burdened.
But the advantage with CALL TRANSACTION is that you will know the success or failure and the reason for failure in your program itself and you can take a subsequent action based on that result. Since your Batch Input Session is creating a new task, there is no immediate feedback that you can use.
Even with a call transaction, it is advisable to keep the BDC data in a session, if the CALL fails. That way you can revisit the transaction and make corrections.
Srinivas

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