Will be possible to have a PRO-Forma invoice and then when the invoice is payed the invoice number is assigned according to last invoice number generated (not the number of the pro-forma); so all payed invoices will have a sequential numeration without "holes".
Is this possible or will be implemented something like that in future?
I try to explain why I need this. Suppose that I let users pay via PayPal and with Bank transfer.
User A pay with paypal -> invoice N-2012-1
User B pay with bank transfer -> pro-forma invoice is created -> pro-forma P-2012-1
In the meanwhile I manually check the payment, User C is paying with paypal, so -> invoice N-2012-2 is created
Now after I check the payment of User B nBill should transform the pro-forma P-2012-1 into N-2012-3
Is this possible? That's what we need for Italy.