title: SVN - Reintegration Merge error: "must be ancestrally related"
body: <p>Using TortoiseSVN - when I use Test Merge, I get the error "<a href="http://mysvnserver/svn/main/branches/ProjectA" rel="noreferrer">http://mysvnserver/svn/main/branches/ProjectA</a> must be ancestrally related to <a href="http://mysvnserver/svn/main/trunk/ProjectB" rel="noreferrer">http://mysvnserver/svn/main/trunk/ProjectB</a>"</p>
  
  <p>What can I do to resolve this?</p>