diff --git a/event_project/models/event_event.py b/event_project/models/event_event.py
index 9b81e4a30..880236268 100644
--- a/event_project/models/event_event.py
+++ b/event_project/models/event_event.py
@@ -25,9 +25,9 @@ def _count_tasks(self):
         self.count_tasks = len(self.task_ids)
 
     def project_data_update(self, vals):
+        recalculate = False
         if self.project_id:
             project_vals = {}
-            recalculate = False
             if vals.get('name'):
                 project_vals['name'] = self.name
             if vals.get('date_begin'):
@@ -38,9 +38,12 @@ def project_data_update(self, vals):
                 recalculate = True
             if project_vals:
                 self.project_id.write(project_vals)
-                if recalculate:
-                    self.project_id.project_recalculate()
-        return True
+                return recalculate
+        return False
+
+    def project_free(self, vals):
+        if self.project_id and vals.get('project_id') is False:
+            self.project_id.write({'event_id': False})
 
     @api.model
     def create(self, vals):
@@ -50,8 +53,9 @@ def create(self, vals):
 
     @api.one
     def write(self, vals):
+        self.project_free(vals)
         super(EventEvent, self).write(vals)
-        if self.env.context.get('no_recalculate'):
-            return True
-        self.project_data_update(vals)
+        recalculate = self.project_data_update(vals)
+        if recalculate and not self.env.context.get('no_recalculate'):
+            self.project_id.project_recalculate()
         return True
diff --git a/event_project/views/event_event_view.xml b/event_project/views/event_event_view.xml
index 4f8c907d8..36d5cbfa5 100644
--- a/event_project/views/event_event_view.xml
+++ b/event_project/views/event_event_view.xml
@@ -23,7 +23,8 @@
                     name="%(action_project_template_wizard)d" type="action"/>
         </button>
         <field name="date_tz" position="after">
-            <field name="project_id"/>
+            <field name="project_id"
+                   domain="[('event_id', '=', False), ('state', 'not in', ('template', 'cancelled', 'close'))]"/>
         </field>
         <div class="oe_right oe_button_box" position="inside">
             <button name="%(act_event_task_list)d"