diff --git a/addons/event_sale/wizard/event_edit_registration.xml b/addons/event_sale/wizard/event_edit_registration.xml
index 801d64d45f4..47bb964b0f2 100644
--- a/addons/event_sale/wizard/event_edit_registration.xml
+++ b/addons/event_sale/wizard/event_edit_registration.xml
@@ -10,7 +10,7 @@
                     please give details about the registrations</p>
                     <field name="event_registration_ids">
                         <tree string="Registration" editable="top" create="false" delete="false">
-                            <field name="event_id" readonly='1'/>
+                            <field name="event_id" readonly='1' force_save="1"/>
                             <field name="registration_id" readonly='1'/>
                             <field name="event_ticket_id" domain="[('event_id', '=', event_id)]" readonly='1'/>
                             <field name="name"/>