title: An NSManagedObjectContext cannot delete objects in other contexts
body: <p>I have two entities, each displaying on its own UITableView section.</p>
  
  <p>I've enabled editing to allow the user to delete rows by swiping to the right.  This works fine for the first entity, but when I try to delete an object in the second entity, I get this error:</p>
  
  <pre><code>An NSManagedObjectContext cannot delete objects in other contexts
  </code></pre>
  
  <p>I get what the error says, but I can't see how it applies here.  I use a retained reference to my context to create, fetch, and delete all objects from the database, so I'm sure there's only the one context.  I'm also not using multiple threads.  Any idea what could be happening?</p>