Diagnosis
Internal error in the communication service (BCS). The sender was notreturned to the application for the send request that is to beprocessed.

System Response
The inbound processing is canceled by the system. No new contact willbe created. Instead, the standard delivery is made to the normal inbox(Transaktion SBWP).

Procedure
Use transaction SBWP to read the newly arrived mail there.
Notify your system administrator.