Dear,
Will updating my exist package with Oxygen 10.3 I got this message
Échec de l'opération: svn: UUID mismatch: existing directory 'trunk/eXist/extensions/xprocxq' was checked out from a different repository
And then, even cleaning the package was not sufficient
It did work with 10.2 (and I didn't try to make it work with 10.3 and without migrating to SVN 1.6)
Cheers,
Xmlizer