https://bugs.openldap.org/show_bug.cgi?id=9392
--- Comment #4 from Quanah Gibson-Mount quanah@openldap.org --- Those are different entries, there is no bug here. If you want to enforce uniqueness across entries, that is not a part of the LDAP standard and would require (with openldap) a correctly configured instance of the slapo-unique overlay.