How do you handle partial billing of POs with inventory items in which the partially billed amount is not proportional to the quantity? Example: PO: 10 Quantity Rate 100 Amount 1000 First Bill: 700 (but this doesn't mean 7/10 of the quantity is billed) Manipulating the Quantity field even though it's not really proportional to quantity does not work all the time since the Quantity field can handle up to 5 decimals only. Sometimes we need more to arrive at the correct partially billed amount.