EDI using file poller

I am trying set up a filepoller for an edi file from a directory .

Have used correct version  xsd from document editor is included in the jdeveloper .

But the  edi file  picked up by  the file poller is failing with error message

"Please make sure that the file content conforms to the schema. Make necessary changes to the file content or the schema."

Looks like the xsd with Transaction as root element is not matching with EDI file with interchange headers .

Not sure the reason for this error .

But any recommendations for edi file poller  in SOA ?