[IMP] stock: add constraint on orderpoint

This commit adds a constraint on model stock.warehouse.orderpoint
(reordering rule) to ensure two orderpoint are not set on the same
product and on the same location. This is an issue as the replenishment
will be done multiple times in case of duplicated rules.

Task : 1939567

closes odoo/odoo#47909

Related: odoo/upgrade#1814
Signed-off-by: William Henrotin <Whenrow@users.noreply.github.com>

addons/stock/models/stock_orderpoint.py

@@ -104,6 +104,7 @@ class StockWarehouseOrderpoint(models.Model):
 
     _sql_constraints = [
         ('qty_multiple_check', 'CHECK( qty_multiple >= 0 )', 'Qty Multiple must be greater than or equal to zero.'),
+        ('product_location_check', 'unique (product_id, location_id, company_id)', 'The combination of product and location must be unique.'),
     ]
 
     @api.depends('warehouse_id')