title: remove foreign key property cause an exception
body: <p>I don't want to use foreign key association to CompanyType (member that will hold the foreign key id) but prefer to use navigation property. So I removed the CompanyTypeId.</p>
  
  <p>I get this exception that relates the relationship between entity Company and CompanyType:  </p>
  
  <blockquote>
    <p>Error 5: The element 'Principal' in
    namespace
    '<a href="http://schemas.microsoft.com/ado/2008/09/edm" rel="nofollow noreferrer">http://schemas.microsoft.com/ado/2008/09/edm</a>'
    has incomplete content. List of
    possible elements expected:
    'PropertyRef' in namespace
    '<a href="http://schemas.microsoft.com/ado/2008/09/edm" rel="nofollow noreferrer">http://schemas.microsoft.com/ado/2008/09/edm</a>'.</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/U4O3W.jpg" alt="enter image description here"></p>
  
  <p>How can I remove those id's from the POCOs without getting the exception?</p>