What stops me from packaging and shipping an order when the inventory is negative?

What stops me from packaging and shipping an order when the inventory is negative?


It seems if the inventory value is negative, that Zoho Inventory should not allow me to create a Package and Ship it.  

But, there seems to be nothing to stop me from doing that other than when I go to physically package the item and realize that there is no stock.

There also seems to be nothing on the screen that even indicates to me that I should not package and ship. 

To me this is the fundamental point of an inventory system. 

Am I doing something wrong?