SOAP Receiver Error: HTTP Error response for SOAP Request

Hi gurus,

I'm facing a weird error in File --> PI 7.31 java only --> soap receiver proxy.

The other interfaces runs well. just one get the the following error:

Exception caught by adapter framework: java.io.IOException: Error receiving or parsing request message: java.io.IOException: HTTP Error response for SOAP request or invalid content-type.

I check the payload and test in the inbound proxy. on error.

Any hints?

Thanks a lot!

regards

Christine