title: Entity Framework update table with rowguid
body: <p>I am using MERGE REPLICATION on my server and now all tables have a <code>rowguid</code>, the last models generated before this change is working very good, but now the new table I imported (using database-first) get the <code>rowguid</code> and making impossible to update, I deleted this column in <code>Model.edmx</code> and I got this error.</p>
  
  <blockquote>
    <p>Error 3023: Problem in mapping fragments starting at line 551: Column Location.rowguid in table Location must be mapped: It has no default value and is not nullable.</p>
  </blockquote>