Got an error "The receipt was unsigned, and a signed receipt was expected".

We are upgrading to 7.1.3 WM and upon testing we encountered some errors. We have an SA2 partner sent a file, we received the file but got an error “The receipt was unsigned, and a signed receipt was expected”. Our partner says he did not received the MDN. Please help.

Here’s the error below.

Document - outbound MDN
Version -
Date/Time - 2010/07/19 10:24:05.418

Error -

wm.tn.doc:view

com.wm.app.b2b.server.ServiceException
You do not have the authority to retrieve this document. Only administrators may access documents that they did not send or receive.
com.wm.app.b2b.server.ServiceException: You do not have the authority to retrieve this document. Only administrators may access documents that they did not send or receive.
at wm.tn.docimpl.view(docimpl.java:167)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java:403)
at com.wm.app.b2b.server.invoke.InvokeManager.process(InvokeManager.java:631)
at com.wm.app.b2b.server.util.tspace.ReservationProcessor.process(ReservationProcessor.java:40)
at com.wm.app.b2b.server.invoke.StatisticsProcessor.process(StatisticsProcessor.java:44)
at com.wm.app.b2b.server.invoke.ServiceCompletionImpl.process(ServiceCompletionImpl.java:253)
at com.wm.app.b2b.server.invoke.ValidateProcessor.process(ValidateProcessor.java:51)
at com.wm.app.b2b.server.ACLManager.process(ACLManager.java:228)