diff --git a/activity_validation/data/mail_activity_data.xml b/activity_validation/data/mail_activity_data.xml
index 27c16f9e..009a01ac 100755
--- a/activity_validation/data/mail_activity_data.xml
+++ b/activity_validation/data/mail_activity_data.xml
@@ -9,7 +9,7 @@
             <field name="res_model">product.product</field>
             <field name="sequence">200</field>
             <field name="change_activity_type">request</field>
+            <field name="keep_done">True</field>
         </record>
-
     </data>
 </odoo>
diff --git a/activity_validation/models/mail_activity.py b/activity_validation/models/mail_activity.py
index d5ec9e63..b02cfbd2 100755
--- a/activity_validation/models/mail_activity.py
+++ b/activity_validation/models/mail_activity.py
@@ -100,11 +100,8 @@ def changeActivityTypeId(self):
 
     def write(self, vals):
         ret = super(MailActivity, self).write(vals)
-        for activity_id in self:
-            if self.env.user.has_group('activity_validation.group_force_activity_validation_admin'):
-                return ret
-            if activity_id.plm_state == 'done' and 'plm_state' not in vals:
-                raise UserError('You cannot modify a confirmed activity')
+        if self.env.user.has_group('activity_validation.group_force_activity_validation_admin'):
+            return ret
         return ret
 
     def checkConfirmed(self, check=False):
@@ -157,13 +154,6 @@ def isCustomType(self):
                 return True
         return False
 
-    def unlink(self):
-        for activity_id in self:
-            if activity_id.isCustomType():
-                if not self.env.su:
-                    return
-        return super(MailActivity, self).unlink()
-
     def clearChildrenActivities(self):
         for child_id in self.children_ids:
             for child_rel in child_id.mail_children_activity_id.sudo():
@@ -193,7 +183,7 @@ def action_to_done(self):
                     if child_activity_id.plm_state != 'done':
                         close = False
                 if close:
-                    parents._action_done()
+                    parents.children_ids.mail_children_activity_id._action_done()
             else:
                 activity_id._action_done()
 
@@ -217,7 +207,7 @@ def action_to_cancel(self):
     def cancelChildrenECR(self, activity_id):
         for child in activity_id.children_ids:
             if child.plm_state not in ['done', 'cancel']:
-                child.action_to_cancel()
+                child.mail_children_activity_id.action_to_cancel()
 
     def cancelChildrenECO(self, activity_id):
         for child in activity_id.children_ids:
diff --git a/activity_validation/models/mail_activity_shedule.py b/activity_validation/models/mail_activity_shedule.py
index 57629003..72c628c3 100644
--- a/activity_validation/models/mail_activity_shedule.py
+++ b/activity_validation/models/mail_activity_shedule.py
@@ -55,15 +55,25 @@ class MailActivitySchedule(models.TransientModel):
 
     def _action_schedule_activities(self):
         res = super()._action_schedule_activities()
-        res.write({
-            'children_ids': [
-                (0, 0, {
-                    'name': self.children_ids.name,
-                    'user_id': self.children_ids.user_id.id,
-                    'mail_children_activity_id' : res.id
-                }),
-            ]
-        })
+        children_data = []
+        for child in self.children_ids:
+            activity = self.env['mail.activity'].create({
+                'summary': res.summary,
+                'activity_type_id': res.activity_type_id.id,
+                'user_id': child.user_id.id,
+                'res_model_id':res.res_model_id.id,
+                'date_deadline':res.date_deadline,
+                'res_id': res.res_id,
+            })
+            children_data.append({
+                'name': child.name,
+                'user_id': child.user_id.id,
+                'mail_children_activity_id': activity.id,
+            })
+
+        if children_data:
+            res.write({'children_ids': [(0, 0, data) for data in children_data]})
+
         return res
 
     def _compute_mail_activity_type(self):
@@ -115,11 +125,8 @@ def changeActivityTypeId(self):
 
     def write(self, vals):
         ret = super(MailActivitySchedule, self).write(vals)
-        for activity_id in self:
-            if self.env.user.has_group('activity_validation.group_force_activity_validation_admin'):
-                return ret
-            if activity_id.plm_state == 'done' and 'plm_state' not in vals:
-                raise UserError('You cannot modify a confirmed activity')
+        if self.env.user.has_group('activity_validation.group_force_activity_validation_admin'):
+            return ret
         return ret
 
     def checkConfirmed(self, check=False):
@@ -224,11 +231,15 @@ def action_to_exception(self):
 
     def action_to_cancel(self):
         for activity_id in self:
-            activity_id.plm_state = 'cancel'
-            self.cancelChildrenECO(activity_id)
-            self.cancelChildrenECR(activity_id)
-            activity_id._action_done()
-
+            if activity_id._name == 'mail.activity':
+                activity_id.plm_state = 'cancel'
+                self.cancelChildrenECO(activity_id)
+                self.cancelChildrenECR(activity_id)
+                activity_id._action_done()
+            else:
+                return {
+                    'type': 'ir.actions.act_window_close',
+                }
     def cancelChildrenECR(self, activity_id):
         for child in activity_id.children_ids:
             if child.plm_state not in ['done', 'cancel']:
diff --git a/activity_validation/views/mail_activity.xml b/activity_validation/views/mail_activity.xml
index 1111c903..20e7aa5a 100755
--- a/activity_validation/views/mail_activity.xml
+++ b/activity_validation/views/mail_activity.xml
@@ -106,8 +106,6 @@
                         </list>
                     </field>
                 </xpath>
-
-
             </field>
         </record>
 
@@ -167,14 +165,12 @@
                     <label for="children_ids"
                            invisible="change_activity_type != 'request'"
                            readonly="plm_state in ['eco', 'done']"/>
-                    <field name="children_ids"
-                           nolabel="1"
-                           invisible="change_activity_type != 'request'"
-                           readonly="plm_state=='eco'">
+                    <field name="children_ids" nolabel="1" invisible="change_activity_type != 'request'" readonly="plm_state=='eco'">
                         <list editable='bottom'>
                             <field name="name"/>
                             <field name="user_id"/>
                             <field name="activity_user_id"/>
+                            <field name="mail_children_activity_id" invisible="1" force_save="1"/>
                             <field name="plm_state" />
                         </list>
                     </field>
diff --git a/plm/data/data.xml b/plm/data/data.xml
index 97dab052..8e15170d 100644
--- a/plm/data/data.xml
+++ b/plm/data/data.xml
@@ -9,6 +9,5 @@
             <field name="sequence">200</field>
             <field name="change_activity_type">request</field>
         </record>
-
     </data>
 </odoo>
diff --git a/plm/views/mail_activity_type.xml b/plm/views/mail_activity_type.xml
index 7b8a783d..8a01cf63 100755
--- a/plm/views/mail_activity_type.xml
+++ b/plm/views/mail_activity_type.xml
@@ -8,6 +8,7 @@
             <field name="res_model">product.product</field>
             <field name="sequence">200</field>
             <field name="change_activity_type">plm_activity</field>
+            <field name="keep_done">True</field>
         </record>
 
 </odoo>