Message type conversion in CALL transaction

Hi all,

We are on ECC6.00. In one of my system the message type 'S' is being coverted to type 'E' while using CALL transaction in a BDC program.

This is not allowing to post the document using BDC. When we try to post the docuemnt directly calling the transaction,

with the same set of data, there is absolutely no problem. Any suggestion on this ??

Best Regards