title: OData - $expand on navigation property of non navigation property
body: <p>For example a simple structure:</p>
  
  <pre><code> MyEntity
     - Property1 (identifier)
     - Property2 (Complex-Type)
        - Property3
        - NavigationProperty1
        - NavigationProperty2
     - NavigationProperty3
     - NavigationProperty4
  </code></pre>
  
  <p>I want to query <code>/MyEntity(1)?$expand=Property2/NavigationProperty1</code> but our (Olingo) Server ignores the entire expand part of the URL and returns the <code>MyEntity</code> entity without the <code>NavigationProperty1</code> property.</p>
  
  <p>Should it be possible at all to expand a navigation property of a non navigation property?</p>