There was a failure executing the receive pipeline: “Microsoft.BizTalk.DefaultPipelines.XMLReceive, Microsoft.BizTalk.DefaultPipelines, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35” Source: “XML disassembler” Receive Port: “EDI837P_ReceivePort1” URI: “\\SERVER\folder\*.xml” Reason: Finding the document specification by message type “EDIMsg” failed. Verify the schema deployed properly.

Make sure that you don’t have the same schema deployed twice!