title: OData - filter by nested property
body: <p>does anyone know how to express an OData $filter against a nested property?</p>
  
  <p>for ex. I have the following Atom entry,</p>
  
  <pre><code>&lt;entry&gt;
  ...
   &lt;m:properties&gt;
  ...
    &lt;d:RegardingObjectId m:type="Microsoft.Crm.Sdk.Data.Services.EntityReference"&gt;
    &lt;d:Id m:type="Edm.Guid"&gt;3f3712fd-fc49-e211-8eb8-000c296272c8&lt;/d:Id&gt; 
    &lt;d:LogicalName&gt;new_sportsleague&lt;/d:LogicalName&gt; 
    &lt;d:Name&gt;Boca&lt;/d:Name&gt; 
    &lt;/d:RegardingObjectId&gt;
  </code></pre>
  
  <p>I want to filter for those entries that have RegardingObjectId/LogicalName eq 'new_sportsleague'.</p>
  
  <p>Tried with 'RegardingObjectId/LogicalName' and 'RegardingObjectId.LogicalName' with no luck.</p>