[FIX] crm: cannot order a model by a non-stored field

addons/crm/models/crm_lead.py

@@ -52,7 +52,7 @@ CRM_LEAD_FIELDS_TO_MERGE = [
 class Lead(models.Model):
     _name = "crm.lead"
     _description = "Lead/Opportunity"
-    _order = "priority desc,activity_date_deadline,id desc"
+    _order = "priority desc, id desc"
     _inherit = ['mail.thread.cc', 'mail.thread.blacklist', 'mail.activity.mixin',
                 'utm.mixin', 'format.address.mixin', 'phone.validation.mixin']
     _primary_email = 'email_from'

addons/crm/views/crm_lead_views.xml

@@ -640,7 +640,7 @@
             <field name="name">crm.lead.tree.opportunity.next.activity</field>
             <field name="model">crm.lead</field>
             <field name="arch" type="xml">
-                <tree string="Next Activities" decoration-danger="activity_date_deadline and (activity_date_deadline &lt; current_date)" default_order="activity_date_deadline">
+                <tree string="Next Activities" decoration-danger="activity_date_deadline and (activity_date_deadline &lt; current_date)">
                     <field name="name"/>
                     <field name="partner_id"/>
                     <field name="activity_date_deadline"/>