Hiding SOAP Body in acknowledgement

Hello Experts,

We have a business partner that is having issues consuming the acknowledgment on an Asynchronous SOAP call to PI.  The reply from PI 7.1 SOAP sender adapter is this:

<SOAP:Envelope xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/">

   <SOAP:Header/>

   <SOAP:Body/>

</SOAP:Envelope>

The presence of the <SOAP:Body/> is causing issues because the WSDL generated from PI does not include the <SOAP:Body/> as a response.

I have tried testing this by selecting the Do Not Use SOAP Envelope check box on the communication channel, but then I am not getting the payload on the request.

Any suggestions would be appreciated.

Thanks!

Tom