title: Unable to update the EntitySet 'ItemRankList' because it has a DefiningQuery and no <UpdateFunction> element exists
body: <p>Any ideas why does the entity framework in LINQ gives following strange error:</p>
  
  <blockquote>
    <p>Unable to update the EntitySet 'ItemRankList' because it has a DefiningQuery and no  element exists in the  element to support the current operation.</p>
  </blockquote>