hi bobstery,
Where do you have this above statement after querying the webservice(probably you might have done this after querying the webservice, just a confirmation).
Do one thing, put "("/dfs:myFields/dfs:dataFields/tns:insertNumberResponse/tns:insertNumberResult")" this field on the InfoPath UI and check what is the result in the UI.
Or debug your webservice when you are calling the webservice method from the InfoPath, and see what output does that webservice return on success.
Otherwise i see no reason for message being wrong.
Agni
InfoPath Dev India