It may also indicate that the schema between the master and replica do not match.
Can you explain?
See above. Without knowledge of the schema on both servers, nor the knowledge of what the entry looked like on the master pre-modification and the entry on the replica as it exists, and what the entry is now, everything is all speculation. The fact the master accepted the operation would generally indicate that there is a serious mismatch in some way between the master and the replica.
--Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>