Hi Vamshi,
If you really need to read/download the BDocs I'd approach that as follows:
- Get the ID of the BDocs in the intermediate state in SMW01
- Read the details of these BDocs using class CL_SMW_BDOCMESSAGE and methods GET_INSTANCE_FROM_ID and GET_EXTENSION
In the extension part of the BDoc you'll find the details like account number.
Christian