[389-users] attribute uniqneness plugin error: Another entry with the same attribute value already exists

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This is another bug exists in 1.2.10.12, but not exists in 1.2.11.14

enable cn=attribute uniqueness,cn=plugins,cn=config
  with the default attribute: uid
copy and create cn=attribute test uniqueness,cn=plugins,cn=config
  with another attribute, for example: sn, just for testing purpose.

After restart, try to change a user's rdn: uid, you will get the following error:

Another entry with the same attribute value already exists (attribute: "sn")


dn: cn=attribute test uniqueness,cn=plugins,cn=config
objectClass: top
objectClass: nsSlapdPlugin
objectClass: extensibleObject
cn: attribute test uniqueness
nsslapd-pluginPath: libattr-unique-plugin
nsslapd-pluginInitfunc: NSUniqueAttr_Init
nsslapd-pluginType: preoperation
nsslapd-pluginEnabled: on
nsslapd-pluginarg0: sn
nsslapd-pluginarg1: dc=example,dc=com
nsslapd-plugin-depends-on-type: database
nsslapd-pluginId: NSUniqueAttr
nsslapd-pluginVersion: 1.2.10.12
nsslapd-pluginVendor: 389 Project
nsslapd-pluginDescription: Enforce unique attribute values
modifiersName: uid=admin,ou=Administrators,ou=TopologyManagement,o=NetscapeRoo
 t
modifyTimestamp: 20130123180354Z

dn: cn=attribute uniqueness,cn=plugins,cn=config
objectClass: top
objectClass: nsSlapdPlugin
objectClass: extensibleObject
cn: attribute uniqueness
nsslapd-pluginPath: libattr-unique-plugin
nsslapd-pluginInitfunc: NSUniqueAttr_Init
nsslapd-pluginType: preoperation
nsslapd-pluginEnabled: on
nsslapd-pluginarg0: uid
nsslapd-pluginarg1: dc=example,dc=com
nsslapd-plugin-depends-on-type: database
nsslapd-pluginId: NSUniqueAttr
nsslapd-pluginVersion: 1.2.10.12
nsslapd-pluginVendor: 389 Project
nsslapd-pluginDescription: Enforce unique attribute values
modifiersName: uid=admin,ou=Administrators,ou=TopologyManagement,o=NetscapeRoo
 t
modifyTimestamp: 20130123180354Z