diff --git a/openerp/addons/base/res/res_partner.py b/openerp/addons/base/res/res_partner.py
index 0d898c2d848..50a928df5e9 100644
--- a/openerp/addons/base/res/res_partner.py
+++ b/openerp/addons/base/res/res_partner.py
@@ -193,12 +193,6 @@ class res_partner(osv.osv, format_address):
             result[obj.id] = obj.image != False
         return result
 
-    def _has_user_ids(self, cr, uid, ids, name, args, context=None):
-        result = {}
-        for obj in self.browse(cr, uid, ids, context=context):
-            result[obj.id] = bool(obj.user_ids)
-        return result
-
     _order = "name"
     _columns = {
         'name': fields.char('Name', size=128, required=True, select=True),
@@ -269,7 +263,6 @@ class res_partner(osv.osv, format_address):
         'company_id': fields.many2one('res.company', 'Company', select=1),
         'color': fields.integer('Color Index'),
         'user_ids': fields.one2many('res.users', 'partner_id', 'Users'),
-        'has_user_ids': fields.function(_has_user_ids,  type='boolean', string='Is a user'),
         'contact_address': fields.function(_address_display,  type='char', string='Complete Address'),
     }
 
diff --git a/openerp/addons/base/res/res_partner_view.xml b/openerp/addons/base/res/res_partner_view.xml
index 18187f96d5f..ffb7d76fb20 100644
--- a/openerp/addons/base/res/res_partner_view.xml
+++ b/openerp/addons/base/res/res_partner_view.xml
@@ -111,8 +111,7 @@
                         <group>
                             <field name="category_id" widget="many2many_tags" placeholder="Tags..."/>
                             <field name="function" placeholder="e.g. Sales Director"/>
-                            <field name="has_user_ids" invisible="1"/>
-                            <field name="email" widget="email" required="context.get('force_email', False)" attrs="{'required': [('has_user_ids','!=', False)]}"/>
+                            <field name="email" widget="email" required="context.get('force_email', False)" attrs="{'required': [('user_ids','!=', [])]}"/>
                             <field name="phone"/>
                             <field name="mobile"/>
                         </group>
@@ -176,8 +175,7 @@
                             <field name="phone" placeholder="e.g. +32.81.81.37.00"/>
                             <field name="mobile"/>
                             <field name="fax"/>
-                            <field name="has_user_ids" invisible="1"/>
-                            <field name="email" widget="email" attrs="{'required': [('has_user_ids','!=', False)]}"/>
+                            <field name="email" widget="email" attrs="{'required': [('user_ids','!=', [])]}"/>
                             <field name="title" domain="[('domain', '=', 'contact')]"
                                 options='{"no_open": True}' attrs="{'invisible': [('is_company','=', True)]}" />
                         </group>