diff --git a/product/ERP5/Document/Person.py b/product/ERP5/Document/Person.py
index 3faeb6256ae93ec69710732f06f6d1c4f87db973..0a2e30787bf50a22e62b3b1ddbb885a74ed92d53 100755
--- a/product/ERP5/Document/Person.py
+++ b/product/ERP5/Document/Person.py
@@ -70,6 +70,7 @@ class Person(Entity, Node, XMLObject):
                       , PropertySheet.XMLObject
                       , PropertySheet.CategoryCore
                       , PropertySheet.DublinCore
+                      , PropertySheet.Reference
                       , PropertySheet.Person
                       )
 
diff --git a/product/ERP5/PropertySheet/Person.py b/product/ERP5/PropertySheet/Person.py
index 642a80867a1c4764cb95b8811e7df0a3c54b1435..f6a3a3e4b086ace827a5016c525b059c071ab008 100755
--- a/product/ERP5/PropertySheet/Person.py
+++ b/product/ERP5/PropertySheet/Person.py
@@ -35,11 +35,6 @@ class Person:
 
   _properties = (
     # Personnal properties
-    { 'id'         : 'reference'
-    , 'description': 'Also know as user login.'
-    , 'type'       : 'string'
-    , 'mode'       : 'w'
-    },
     { 'id'         : 'password'
     , 'description': ''
     , 'type'       : 'string'