I generated serial numbers for items and there is no way to generate more serial numbers that the number of items being "sold" or created. This is annoying as how does one know what serial number they left off with when they go to receive or sell this item again? Then, it doesn't save your last one so no consistency in being able to start where one left off. Then once created, found how to display them on packing lists and such, but they are not on the invoices. 

Any way to get serial numbers on invoices?