title: DevExpress Menu linked to a siteMap
body: <p>I have a MVC4 project with a sitemap and a devexpress menu item on my _Layout page. 
  I have a section in my siteMap for InwardsGoods and an index page where the user can QueryDeliveries. The QueryDeliveries is the same page as the InwardsGoods home(Index) page.</p>
  
  <pre><code>&lt;siteMapNode url="InwardsGoods/Index" title="Stock and Deliveries"  description=""&gt;
    &lt;siteMapNode url="InwardsGoods/Index" title="Query Deliveries"  description=""/&gt;
  &lt;/siteMapNode&gt;
  </code></pre>
  
  <p>When I try to run this it complains about "ConfigurationErrorsException was unhandled by user code" Then "The site map file is invalid"</p>
  
  <p>What I dont understand is when I run the siteMap without the url it runs the menu fine, obviously the link to Query Deliveries wont go anywhere though.</p>
  
  <pre><code>&lt;siteMapNode url="InwardsGoods/Index" title="Stock and Deliveries"  description=""&gt;
    &lt;siteMapNode url="" title="Query Deliveries"  description=""/&gt;
  &lt;/siteMapNode&gt;
  </code></pre>
  
  <p>How can I edit the sitemap to allow for both siteMapNodes to work?</p>