negative inventory

Hi MelinC 

If you're using inventoried items, you should get an error message every time a sale with a shipping quantity more than the quantity on hand is tried to be processed. The warning message will be something like this: 

Selecting to backorder will process the invoice and will create one order for the backorder item, as a result of which quantity on hand can go below zero. The only way to avoid recording the sale would be by clicking cancel on this window instead of back-ordering. 

Alternatively, you can also set a minimum level of restocking alert in the buying details of the item which will alert you to place a purchase order for any items that go below the specified quantity.  That said, if you used to get a different warning message, please let us know so we can advise accordingly.