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    <p>Juding by your code <code>Unit = selectedUnit</code> and <code>p.Destinations.Add(dest);</code> and the other symptoms you describe you seem to have the exact same situation. My findings below have fixed the problem for me. </p> <p>Interested also if you ended up with any duplicated entities in your database as a result of this. i was getting rows already previously saved magically turning to <code>New</code> and then becoming dupe records. Again this simple change below fixed it.</p> <hr> <p>There is a race condition i discovered that can give this error if you create an entity and immediately assign foreign key relationships to it before adding the parent entity to its entity set. </p> <p>Turns out the very act of setting the foreign key relationship actually adds the entity to its corresponding entity set - but sometimes causes a race condition, especially if your UI is loading and saving and clearing entity sets.</p> <p><strong>bad:</strong></p> <pre><code>var todo = new TODO(); todo.Status = TODOContext.Statuses.Single(x=&gt;x.Status == "Unknown"); todo.AssignedTo = TODOContext.Users.Single(x=&gt;x.UserName == "JSMITH"); TODOContext.TODOs.Add(todo); // adding entity after setting FK </code></pre> <p><strong>good:</strong></p> <pre><code>var todo = new TODO(); TODOContext.TODOs.Add(todo); // add entity before setting FK todo.Status = TODOContext.Statuses.Single(x=&gt;x.Status == "Unknown"); todo.AssignedTo = TODOContext.Users.Single(x=&gt;x.UserName == "JSMITH"); </code></pre>
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