diff --git a/addons/sale_purchase/models/purchase_order.py b/addons/sale_purchase/models/purchase_order.py
index a190130c5ce..e4bd496b973 100644
--- a/addons/sale_purchase/models/purchase_order.py
+++ b/addons/sale_purchase/models/purchase_order.py
@@ -63,7 +63,7 @@ class PurchaseOrder(models.Model):
                 views_or_xmlid='sale_purchase.exception_sale_on_purchase_cancellation',
                 render_context={
                     'purchase_orders': purchase_order_lines.mapped('order_id'),
-                    'purchase_lines': purchase_order_lines,
+                    'purchase_order_lines': purchase_order_lines,
             })