title: How to find out which Entity in Dynamics CRM is system?
body: <p>I am using the request to <code>GET "/api/data/v9.0/EntityDefinitions"</code> to list all the entities that are present in Dynamics. But the problem is that I cannot find which field indicates that this entity is system. </p>
  
  <p>Can anyone provide me with a solution to this minor issue?</p>