Conditional xpath following B1 Object

I have the following message output after I call a B1 Object (atom17):

   </Payload><Payload Role="C" id="atom17" system="0010000109" status="success" b1login="Technical User" method="Synchronous Insert" objectid="59" payload="atom18"keyname="DocEntry" keyvalue="" DIresult="failure" DImsg="&#xA;Exception : DI Error: (-2028) No matching records found (ODBC -2028)"/>

The xml editor show the following xpath for the DIresult:

/Msg/Body/Payload[10]/@DIresult

I am trying get an expression for conditional processing.  The following should be close but B1if tells me the path is invalid:

/*[/vpf:Msg/vpf:Body/vpf:Payload[./@id='atom17']/@DIresult=‘failure’]

Can you tell me what the path should be or look like?