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diff --git a/addons/website_sale_stock/controllers/main.py b/addons/website_sale_stock/controllers/main.py
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+++ b/addons/website_sale_stock/controllers/main.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+from odoo.addons.website_sale.controllers.main import WebsiteSale
+
+from odoo import http,_
+from odoo.http import request
+from odoo.exceptions import ValidationError
+
+
+class WebsiteSaleStock(WebsiteSale):
+    @http.route()
+    def payment_transaction(self, *args, **kwargs):
+        """ Payment transaction override to double check cart quantities before
+        placing the order
+        """
+        order = request.website.sale_get_order()
+        values = []
+        for line in order.order_line:
+            if line.product_id.type == 'product' and line.product_id.inventory_availability in ['always', 'threshold']:
+                cart_qty = sum(order.order_line.filtered(lambda p: p.product_id.id == line.product_id.id).mapped('product_uom_qty'))
+                avl_qty = line.product_id.with_context(warehouse=order.warehouse_id.id).virtual_available
+                if cart_qty > avl_qty:
+                    values.append(_(
+                        'You ask for %(quantity)s products but only %(available_qty)s is available',
+                        quantity=cart_qty,
+                        available_qty=avl_qty if avl_qty > 0 else 0
+                    ))
+        if values:
+            raise ValidationError('. '.join(values) + '.')
+        return super(WebsiteSaleStock, self).payment_transaction(*args, **kwargs)