diff --git a/addons/event/models/event_registration.py b/addons/event/models/event_registration.py
index e22283172e2..361ac3ad416 100644
--- a/addons/event/models/event_registration.py
+++ b/addons/event/models/event_registration.py
@@ -16,9 +16,6 @@ class EventRegistration(models.Model):
     _order = 'id desc'
 
     # event
-    origin = fields.Char(
-        string='Source Document', readonly=True,
-        help="Reference of the document that created the registration, for example a sales order")
     event_id = fields.Many2one(
         'event.event', string='Event', required=True,
         readonly=True, states={'draft': [('readonly', False)]})
diff --git a/addons/event/views/event_views.xml b/addons/event/views/event_views.xml
index 0fa44da509e..a0d247928ec 100644
--- a/addons/event/views/event_views.xml
+++ b/addons/event/views/event_views.xml
@@ -518,7 +518,6 @@
                     <field name="mobile" optional="hide"/>
                     <field name="event_id"/>
                     <field name="event_ticket_id" domain="[('event_id', '=', event_id)]"/>
-                    <field name="origin" optional="hide"/>
                     <field name="state" readonly="0"/>
                     <field name="company_id" groups="base.group_multi_company" optional="hide"/>
                     <field name="message_needaction" invisible="1"/>
@@ -649,7 +648,7 @@
             <field name="arch" type="xml">
                 <search string="Event Registration">
                     <field name="id" string="Registration ID"/>
-                    <field name="name" string="Participant" filter_domain="['|', '|', ('name', 'ilike', self), ('email', 'ilike', self), ('origin', 'ilike', self)]"/>
+                    <field name="name" string="Participant" filter_domain="['|', '|', ('name', 'ilike', self), ('email', 'ilike', self)]"/>
                     <filter string="Ongoing Events" name="filter_is_ongoing" domain="[('event_id.is_ongoing', '=', True)]"/>
                     <separator/>
                     <filter string="Unread Messages" name="message_needaction" domain="[('message_needaction','=',True)]"/>
diff --git a/addons/event_sale/models/event_registration.py b/addons/event_sale/models/event_registration.py
index 84144973885..f1dc4a315b0 100644
--- a/addons/event_sale/models/event_registration.py
+++ b/addons/event_sale/models/event_registration.py
@@ -9,9 +9,7 @@ class EventRegistration(models.Model):
     _inherit = 'event.registration'
 
     is_paid = fields.Boolean('Is Paid')
-    # in addition to origin generic fields, add real relational fields to correctly
-    # handle attendees linked to sales orders and their lines
-    # TDE FIXME: maybe add an onchange on sale_order_id + origin
+    # TDE FIXME: maybe add an onchange on sale_order_id
     sale_order_id = fields.Many2one('sale.order', string='Source Sales Order', ondelete='cascade')
     sale_order_line_id = fields.Many2one('sale.order.line', string='Sales Order Line', ondelete='cascade')
     campaign_id = fields.Many2one('utm.campaign', 'Campaign', related="sale_order_id.campaign_id", store=True)
@@ -32,7 +30,7 @@ class EventRegistration(models.Model):
             )
             vals.update(so_line_vals)
         res = super(EventRegistration, self).create(vals)
-        if res.origin or res.sale_order_id:
+        if res.sale_order_id:
             res.message_post_with_view(
                 'mail.message_origin_link',
                 values={'self': res, 'origin': res.sale_order_id},
@@ -59,7 +57,6 @@ class EventRegistration(models.Model):
                 'partner_id': so_line.order_id.partner_id.id,
                 'event_id': so_line.event_id.id,
                 'event_ticket_id': so_line.event_ticket_id.id,
-                'origin': so_line.order_id.name,
                 'sale_order_id': so_line.order_id.id,
                 'sale_order_line_id': so_line.id,
             }
diff --git a/addons/event_sale/tests/test_event_sale.py b/addons/event_sale/tests/test_event_sale.py
index fb121228bd6..70a38f88395 100644
--- a/addons/event_sale/tests/test_event_sale.py
+++ b/addons/event_sale/tests/test_event_sale.py
@@ -65,5 +65,5 @@ class EventSaleTest(common.TransactionCase):
         # I click apply to create attendees
         self.register_person.action_make_registration()
         # I check if a registration is created
-        registrations = self.EventRegistration.search([('origin', '=', self.sale_order.name)])
+        registrations = self.EventRegistration.search([('sale_order_id', '=', self.sale_order.id)])
         self.assertTrue(registrations, "The registration is not created.")
diff --git a/addons/event_sale/views/event_registration_views.xml b/addons/event_sale/views/event_registration_views.xml
index e44a1f8d436..fea2fbb0362 100644
--- a/addons/event_sale/views/event_registration_views.xml
+++ b/addons/event_sale/views/event_registration_views.xml
@@ -7,7 +7,7 @@
         <field name="inherit_id" ref="event.view_event_registration_tree" />
         <field name="arch" type="xml">
             <field name="event_id" position="after">
-                <field name="origin"/>
+                <field name="sale_order_id"/>
             </field>
         </field>
     </record>
@@ -41,7 +41,6 @@
             <group name="event" position="after">
                 <group string="Origin" groups="base.group_no_one">
                     <field name="sale_order_id"/>
-                    <field name="origin" attrs="{'invisible': [('sale_order_id', '!=', False)]}"/>
                     <field name="sale_order_line_id" readonly="1" attrs="{'invisible': [('sale_order_id', '=', False)]}"/>
                 </group>
                 <group string="Marketing" name="utm_link" groups="base.group_no_one">
diff --git a/addons/event_sale/wizard/event_edit_registration.py b/addons/event_sale/wizard/event_edit_registration.py
index 9fedfd84f39..29c00065856 100644
--- a/addons/event_sale/wizard/event_edit_registration.py
+++ b/addons/event_sale/wizard/event_edit_registration.py
@@ -85,7 +85,6 @@ class RegistrationEditorLine(models.TransientModel):
             'phone': self.phone or self.editor_id.sale_order_id.partner_id.phone,
             'mobile': self.mobile or self.editor_id.sale_order_id.partner_id.mobile,
             'email': self.email or self.editor_id.sale_order_id.partner_id.email,
-            'origin': self.editor_id.sale_order_id.name,
             'sale_order_id': self.editor_id.sale_order_id.id,
             'sale_order_line_id': self.sale_order_line_id.id,
         }