We currently allow customers to continue purchasing items when inventory is out of stock, so they will get a "backorder" option if they order something with an inventory quantity of 0. The problem we're facing is where we have, say 20 units in stock and a customer orders 40 - currently nothing notifies the customer that they are ordering a quantity > what's available.
Does anyone know a way to address this? Either through an alert when the quantity exceeds what's available or in the cart somewhere?
Thanks in advance for any suggestions!