diff --git a/addons/stock/models/product.py b/addons/stock/models/product.py
index 4876ba58ade..525af9a8ab0 100644
--- a/addons/stock/models/product.py
+++ b/addons/stock/models/product.py
@@ -702,7 +702,7 @@ class ProductTemplate(models.Model):
 
     def _compute_quantities_dict(self):
         variants_available = {
-            p['id']: p for p in self.product_variant_ids.read(['qty_available', 'virtual_available', 'incoming_qty', 'outgoing_qty'])
+            p['id']: p for p in self.product_variant_ids._origin.read(['qty_available', 'virtual_available', 'incoming_qty', 'outgoing_qty'])
         }
         prod_available = {}
         for template in self:
@@ -710,7 +710,7 @@ class ProductTemplate(models.Model):
             virtual_available = 0
             incoming_qty = 0
             outgoing_qty = 0
-            for p in template.product_variant_ids:
+            for p in template.product_variant_ids._origin:
                 qty_available += variants_available[p.id]["qty_available"]
                 virtual_available += variants_available[p.id]["virtual_available"]
                 incoming_qty += variants_available[p.id]["incoming_qty"]