
Outgoing invoices → open a sent invoice → Credit note
Open the outgoing invoice you want to credit.
Click Credit note.
Confirm the action.
Open the new credit note by its returned ID.
The original invoice stays unchanged.
Open the credit note record.
Update the values you need.
Save your changes.
Treat the credit note as its own invoice.
Open the original invoice.
Open the credit note.
Check each document separately before sending.
The credit note does not overwrite the sent invoice.