How to create credit invoice

In order to credit existing invoice and and create new invoice there are steps you need to take

1. Make credit invoice
2. Make new invoice
3. Edit total income sum
4. Clear invoice and its credit invoice debts

Open invoice you need to credit

From ... menu choose Create credit invoice

It will make another invoice with Type Credit invoice and the same sum only with - (minus)
If you need to credit different sum then Press Edit (pencil button) in invoice content list and change the sum you need

If you need to write new invoice for Client order you credited invoice, then go to Client order and make from there new invoice

At the end Client order correct Income sum so that it is total of all Outgoing invoices

Clear the debts for Invoice and its credit invoice