https://bugs.openldap.org/show_bug.cgi?id=9725
--- Comment #5 from Howard Chu hyc@openldap.org --- Since lastbindprecision is now a db-level setting in 2.6, there is no good reason to keep it as an overlay setting. This setting should be deleted from the overlay and it should just use the value of the db-level setting.
For migration purposes the overlay can continue to recognize the setting, but only as a no-op, and perhaps with emitting a warning. Though it may just be safer not to recognize it, and let the config fail with an error.