diff --git a/coworking_coworker/models/res_partner.py b/coworking_coworker/models/res_partner.py
index 81aedfb..62ca82d 100644
--- a/coworking_coworker/models/res_partner.py
+++ b/coworking_coworker/models/res_partner.py
@@ -34,9 +34,29 @@ class ResPartner(models.Model):
             coworker.full_contact_adress = u'{} {} {}'.format \
             (coworker.street or u'', coworker.zip or u'', coworker.city or u'').strip()
 
-
     @api.constrains('contact_date')
     def _check_contact_date(self):
         """Test si la modification de la date n'est pas superieur à la date du jour"""
         if self.contact_date > fields.Date.context_today(self):
             raise ValidationError(_('Date most be equal of inferior to to day'))
+
+    @staticmethod
+    def _manage_coworker_type(vals):
+        """ Ensures that coworker_type is not defined when is_coworker is False """
+        if 'is_coworker' in vals:
+            if not vals['is_coworker']:
+                vals.update({'coworker_type': False})
+        return vals
+
+    @api.model
+    def create(self, vals):
+        """ Ensures that coworker_type is not defined when is_coworker is False """
+        vals = ResPartner._manage_coworker_type(vals)
+        return super(ResPartner, self).create(vals)
+
+    @api.multi
+    def write(self, vals):
+        """ Ensures that coworker_type is not defined when is_coworker is False """
+        vals = ResPartner._manage_coworker_type(vals)
+        super(ResPartner, self).write(vals)
+        return True
diff --git a/coworking_coworker/views/res_partner_views.xml b/coworking_coworker/views/res_partner_views.xml
index ac0b79c..9406b61 100644
--- a/coworking_coworker/views/res_partner_views.xml
+++ b/coworking_coworker/views/res_partner_views.xml
@@ -42,9 +42,14 @@
     <field name="inherit_id" ref ="base.view_res_partner_filter" />
     <field name="arch" type="xml">
       <search position="inside">
+        <filter name="group_coworker_type" string="Group coworker type"
+          context="{'group_by': 'coworker_type'}" />
+        <filter name="group_title" string="by title"
+          context="{'group_by': 'title'}" />
+        <filter name="group_city" string="City"
+          context="{'group_by': 'city'}" />
         <filter name="is_coworker" string="Coworker"
           domain="[('is_coworker','=',True)]" />
-      <separator />
         <filter name="group_month" string="Month"
           context="{'group_by': 'contact_date:month'}" />
         <filter name="group_year" string="Year"
@@ -101,12 +106,11 @@
   </record>
 
   <record id="view_pivot_res_partner" model="ir.ui.view">
-  <field name="name">res.partner.pivot</field>
+  <field name="name">pivot</field>
   <field name="model">res.partner</field>
    <field name="arch" type="xml">
-     <pivot>
-       <field name="is_coworker" type="col" />
-       <field name="user_id" />
+     <pivot string="titre pivot">
+       <field name="title" type="col" />
        <field name="contact_date" interval="week" />
      </pivot>
    </field>
diff --git a/coworking_event/models/event.py b/coworking_event/models/event.py
index 7264c29..fabb603 100644
--- a/coworking_event/models/event.py
+++ b/coworking_event/models/event.py
@@ -73,8 +73,9 @@ class Event(models.Model):
     @api.constrains('date_start', 'date_end')
     def _check_dates(self):
         """Test si la modification de la date de début est infnérieure à la date de fin"""
-        if self.date_start > self.date_end:
-            raise ValidationError(_('End date most be supperior to to start date'))
+        for event in self:
+            if event.date_start > event.date_end:
+                raise ValidationError(_('End date most be supperior to to start date'))
 
     @api.depends('date_start', 'date_end')
     def _compute_duration(self):
diff --git a/coworking_event/wizard/coworking_event_weekly.py b/coworking_event/wizard/coworking_event_weekly.py
index fdf782e..800215f 100644
--- a/coworking_event/wizard/coworking_event_weekly.py
+++ b/coworking_event/wizard/coworking_event_weekly.py
@@ -14,7 +14,7 @@ class CoworkingEventWeekly(models.TransientModel):
     _description = 'Weekly massive event creation'
 
     title = fields.Char(required=True)
-    manager_id = fields.Many2one('coworking.res_partner', string='Manager',
+    manager_id = fields.Many2one('res.partner', string='Manager',
                                  required=True)
     date_start_recurence = fields.Datetime('Date start', required=True)
     date_stop_recurence = fields.Datetime('Date stop', required=True)
diff --git a/coworking_relation/__manifest__.py b/coworking_relation/__manifest__.py
index 82daa2a..0cd6cf9 100644
--- a/coworking_relation/__manifest__.py
+++ b/coworking_relation/__manifest__.py
@@ -26,7 +26,7 @@
     'application': False,
     'installable': True,
     'data': ['security/ir.model.access.csv',
-            #  'views/relation_menu.xml',
+             'views/relation_menu.xml',
              'views/relation_views.xml',
              'views/res_partner_views.xml'],
     'depends': ['coworking_coworker']
diff --git a/coworking_relation/models/relation.py b/coworking_relation/models/relation.py
index ef8d88b..41c4277 100644
--- a/coworking_relation/models/relation.py
+++ b/coworking_relation/models/relation.py
@@ -15,12 +15,12 @@ class CoworkerRelation(models.Model):
     name = fields.Char()
 
     coworker1 = fields.Many2one(
-        'coworking.coworker', 'Coworker 1', index=True, required=True,
-        domain="[('coworker_type', 'in', ['staffer', 'member', 'worker', 'volunteer', 'visitor'])]"
+        'res.partner', 'Coworker 1', index=True, required=True,
+        domain="[('is_coworker', '=', True)]"
     )
     coworker2 = fields.Many2one(
-        'coworking.coworker', 'Coworker 2', index=True, required=True,
-        domain="[('coworker_type', 'in', ['staffer', 'member', 'worker', 'volunteer', 'visitor'])]"
+        'res.partner', 'Coworker 2', index=True, required=True,
+        domain="[('is_coworker', '=', True)]"
     )
     relation = fields.Char(index=True, required=True)
 
diff --git a/coworking_relation/views/relation_menu.xml b/coworking_relation/views/relation_menu.xml
index 3426ae6..a234aff 100644
--- a/coworking_relation/views/relation_menu.xml
+++ b/coworking_relation/views/relation_menu.xml
@@ -7,6 +7,6 @@
     res_model="coworking.relation" view_mode="tree" />
   <!-- Menu item to open Event list -->
   <menuitem id="coworker_relation_menu" name="Relations" action="relation_action"
-    parent="coworking_coworker.coworker_menu" sequence="2" />
+    parent="contacts.menu_contacts" sequence="2" />
 
 </odoo>
diff --git a/coworking_relation/views/relation_views.xml b/coworking_relation/views/relation_views.xml
index 3e5ac1b..26b4bd6 100644
--- a/coworking_relation/views/relation_views.xml
+++ b/coworking_relation/views/relation_views.xml
@@ -11,8 +11,8 @@
       <sheet>
         <group name="group_top">
           <group name="group_left">
-            <field name="coworker1" domain="[('id', '!=', coworker2)]" />
-            <field name="coworker2" domain="[('id', '!=', coworker1)]" />
+            <field name="coworker1" domain="['&amp;', ('id', '!=', coworker2), ('is_coworker', '=', True)]" />
+            <field name="coworker2" domain="['&amp;', ('id', '!=', coworker1), ('is_coworker', '=', True)]" />
             <field name="relation" />
           </group>
         </group>