Special order parts.
Currently it appears the only way to put in a part order is to have it tied with a ticket. There are parts and products that are ordered only once, and that either don't require installation, or the the customer chooses to install themselves. This means no need for a ticket. It would be nice to associate a part order to customer, but not require a ticket.
You can generate Invoices directly from Part Orders! Head here for more info!
Dan Joyce commented
I agree, and am starting a related suggestion to be able to add inventory items as parts orders.
Jamie A commented
Or move from a ticket to inventory. We have order parts for a customer, and then they decide against it. It would be nice to add that part to RS inventory for future sale.