Missing operation for soapAction

I'm experiencing something similar. I have a mock service that uses a query_match to control the dispatch. One of the responses contains script to create a new secondary request while copying in certain information from the original. The first time I execute the mock service's request, it works fine. I can verify both the reply from the mock service and the secondary request are sent. The second time I send the request, I get:

Tue Oct 26 12:00:19 CDT 2010:ERROR:com.eviware.soapui.impl.wsdl.mock.DispatchException: Missing operation for soapAction [http://tempuri] and body element [null] with SOAP Version [SOAP 1.1]

I take this to mean it can't find the response I'm trying to get the mock service to reply with, but I don't know why. Any suggestions? Are there "typical" reasons one would see this error?

Thanks,
Alex