I had some product come in on Friday afternoon, put it right on the shelf, and just created and recieved the Purchase Order today 3 days later.

I sold some of those items over the weekend, and as an example, I sold 2 of X, and it didn'tgot negative in inventory, so now when I created and recieved, inventory shows 6 total, which is what I ordered.  Besides going backwards by hand and adjusting inventory, is there a way to make this smoother in the future?  

It seems the default/only way I see it in item creation is that a product won't go negative until it's been assigned some quantity in the system.

Am I missing something or is this how things should be?