diff --git a/addons/stock/models/stock_quant.py b/addons/stock/models/stock_quant.py
index 600ffc35859..f8c95c5db46 100644
--- a/addons/stock/models/stock_quant.py
+++ b/addons/stock/models/stock_quant.py
@@ -514,15 +514,17 @@ class StockQuant(models.Model):
                             SELECT min(id) as to_update_quant_id,
                                 (array_agg(id ORDER BY id))[2:array_length(array_agg(id), 1)] as to_delete_quant_ids,
                                 SUM(reserved_quantity) as reserved_quantity,
-                                SUM(quantity) as quantity
+                                SUM(quantity) as quantity,
+                                MIN(in_date) as in_date
                             FROM stock_quant
-                            GROUP BY product_id, company_id, location_id, lot_id, package_id, owner_id, in_date
+                            GROUP BY product_id, company_id, location_id, lot_id, package_id, owner_id
                             HAVING count(id) > 1
                         ),
                         _up AS (
                             UPDATE stock_quant q
                                 SET quantity = d.quantity,
-                                    reserved_quantity = d.reserved_quantity
+                                    reserved_quantity = d.reserved_quantity,
+                                    in_date = d.in_date
                             FROM dupes d
                             WHERE d.to_update_quant_id = q.id
                         )