Unable to convert the sender service XXXX to an ALE logical system

Dear Forum members,

could you please kindly help me out the error "Unable to convert the sender service XXXX to an ALE logical system ". The scenario is file-to-idoc. The sender is a BPM and receiver is ISU system. sender and receiver are business services without any logical name , both in SLD and ID. There are other scenarios which are running with same configuartion but I am receiving this error in ceratin BPM's. All namespaces include BPM. There is sender party and receiver party mapping in each receiver agreement, for other idoc scenarios. I have gone through sevaeral articles, blog but no luck.

Could you please kindly help .

regards

Anupam