Your message is not saying that Biztalk didn’t recognize the schema, only that there are now subscribers.
All incoming messages must have a subscriber or else they are considered a useless message.
So either there should be a send port that typically has a filter that relates to either the receive port, receive location, or message type. Or there should be orchestrations that are bound to the receive location (or use direct binding and have filters in the orchestration that tie them to message).
Neal Walters
http://Biztalk-Training.com