diff --git a/addons/point_of_sale/models/pos_session.py b/addons/point_of_sale/models/pos_session.py
index 4e6580e3b74..0bebe549f71 100644
--- a/addons/point_of_sale/models/pos_session.py
+++ b/addons/point_of_sale/models/pos_session.py
@@ -757,7 +757,7 @@ class PosSession(models.Model):
                     for move in stock_moves:
                         exp_key = move.product_id._get_product_accounts()['expense']
                         out_key = move.product_id.categ_id.property_stock_account_output_categ_id
-                        amount = -sum(move.sudo().stock_valuation_layer_ids.mapped('value'))
+                        amount = move.product_qty * move.product_id._compute_average_price(0, move.product_qty, move)
                         stock_expense[exp_key] = self._update_amounts(stock_expense[exp_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
                         if move.location_id.usage == 'customer':
                             stock_return[out_key] = self._update_amounts(stock_return[out_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
@@ -783,7 +783,7 @@ class PosSession(models.Model):
                 for move in stock_moves:
                     exp_key = move.product_id._get_product_accounts()['expense']
                     out_key = move.product_id.categ_id.property_stock_account_output_categ_id
-                    amount = -sum(move.stock_valuation_layer_ids.mapped('value'))
+                    amount = move.product_qty * move.product_id._compute_average_price(0, move.product_qty, move)
                     stock_expense[exp_key] = self._update_amounts(stock_expense[exp_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
                     if move.location_id.usage == 'customer':
                         stock_return[out_key] = self._update_amounts(stock_return[out_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)