olcUpdateRef: <url>
Specify the referral to pass back when slapd(8) is asked to modify a replicated local database. If multiple values are specified, each url is provided. So I guess some of the comments for oldUpdateDN also apply to olcUpdateRef, but it's not obvious for the user. In case the current manual page still isn't that explicit about that, I suggest to change it to match the intended semantics.
It literally states that it only applies with a replicated local database already.
--Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>