SN when adding items to ticket
When you add a serialized item to a ticket under charges, it needs to ask for the serial number then, not when the invoice is created.
A lot of times, especially with hard drives, the item is already in the unit and sealed then the invoice is made. If the tech forgot to write down the serial number, they have to reopen the machine to get it. If it would ask for serial number when add item to charges, that would be very nice.