Due to the nature of our business sometimes we have product that is shop worn and we do not want to take into account as a unit in inventory. In this case, we would like the backorder message to be displayed even thought there is 1 unit in stock.
We have tried establishing the Out-of-stock threshold at 1 so Salable Quantity is (Quantity - (Out-of-Stock Threshold)). In this case 1-1=0 to display back order message.
However, the quantity of Out-of-Stock Threshold keeps reverting to zero because it is not compatible with backorders.