Hello,
according to
http://www.openldap.org/its/index.cgi/Documentation?id=4844;#followup4
the "constraint" Overlay was added to CVS April 29 2006.
I was wondering why it isn't in current 2.3.x releases (after said date, of course), since I really could use the functionality provided by that plugin.
It isn't listed in http://www.openldap.org/software/release/changes.html either.
bye Christian