HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/xml
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Fri, 22 Feb 2013 15:53:42 GMT
Content-Length: 259

<?xml version="1.0"?>
<Exception xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Error xsi:type="ValidationException">
    <Message>Missing parameter: 'Order Number'</Message>
  </Error>
</Exception>