Under cost sales

When you create or edit a order/invoice, the system will auto warning your if you selling price is lower than the bottom price.

The "Info" icon on the right will become Red if the item selling price is lower than the predefined bottom price. You can also click the"Info" icon to see the bottom price. You need type in a password on the bottom to unlock the order so you can create the new order or save the existing order.

The status column will show an red "thumb down" icon if there is an item selling price is under bottom price.

You can also see which item is selling under bottom price by click "Action" -> "Details" page.