In some cases, official invoice is created and sent at the moment it is paid, not before.
The process is: proposal, proposal accepted, work done (or milestone reached), pre invoice sent, payment, official invoice.
At the moment, as per my knowledge, this process is not present in invoice ninja.
Using a duplicate invoice will mess up statistics.
As workaround I am creating an invoice with a special number, stating it is number to recap the payment to do, then when it is paid I will convert manually to a normal number.
Can we do something about it (ie adding a intermediate category between quote and invoice) that we can convert to invoice?
Thanks