diff --git a/addons/event_sale/wizard/event_edit_registration.py b/addons/event_sale/wizard/event_edit_registration.py
index 0526db91646..11c411571a0 100644
--- a/addons/event_sale/wizard/event_edit_registration.py
+++ b/addons/event_sale/wizard/event_edit_registration.py
@@ -54,6 +54,9 @@ class SaleOrderEventRegistration(models.TransientModel):
                     wiz_registration.registration_id.write(wiz_registration.get_registration_data()[0])
                 else:
                     Registration.create(wiz_registration.get_registration_data()[0])
+        if self.env.context.get('active_model') == 'sale.order':
+            for order in self.env['sale.order'].browse(self.env.context.get('active_ids', [])):
+                order.order_line._update_registrations(confirm=True)
         return {'type': 'ir.actions.act_window_close'}