Thanks for the reply thiago .. yes it would be strange if biztalk does suppress the recurring errors
The orchestrations and the host instances are started,as some messages are processed where as the others simply dissappear.
Another failure point that we identified (the code isn’t ours)is that there is a custom pipeline that brings the messages into BizTalk message box.For the messages that don’t have errors we cannot find orchestration instances in the HAT too..thereby making us wonder whether the messages reached the messagebox from the pipeline (though there are no pipeline errors too).
The lack of logs is killing the investigation 🙁