diff --git a/issue7421002_1.diff b/issue7421002_1.diff
new file mode 100644
index 0000000..93f5435
--- /dev/null
+++ b/issue7421002_1.diff
@@ -0,0 +1,16 @@
+Index: trytond/trytond/modules/stock/product.py
+===================================================================
+
+--- a/trytond/trytond/modules/stock/product.py
++++ b/trytond/trytond/modules/stock/product.py
+@@ -299,7 +299,8 @@
+ class ProductQuantitiesByWarehouseStart(ModelView):
+     'Product Quantities By Warehouse'
+     __name__ = 'stock.product_quantities_warehouse.start'
+-    warehouse = fields.Many2One('stock.location', 'Warehouse', domain=[
++    warehouse = fields.Many2One('stock.location', 'Warehouse', required=True,
++        domain=[
+             ('type', '=', 'warehouse'),
+             ])
+
+
diff --git a/series b/series
index 506efd4..7b471f1 100644
--- a/series
+++ b/series
@@ -23,3 +23,4 @@ issue8461003_1.diff
 issue10391004_1.diff
 issue234_703_16370.diff
 ldap_authentication.diff
+issue7421002_1.diff