My store has backorders enabled, everything works as expected when dealing with a quantity of 1 for each product that is available for backorder.
The problem is that when a customer tries to enter a value greater than 1 on the product page or the cart page the error:
The requested quantity is not available
There are no errors logged, products that are In Stock
allow for the quantities to be updated (provided that there are enough).
Has anyone had this issue and what can I do to resolve it?