Why paid invoice can't be edited?
because the payment is already received and editing it will cause miscalculations.
Thanks, I solved that by deleting the payment -> the invoice becomes Not Paid and can be edited 🙂
how you did it? I am in superadmin account and not able to delete my couple test invoices. Searched for payment section to delete the payment ... nothing there
Look in /admin/finance/payments
If there are no payments, then maybe the invoice status is not complete. You can delete only the last issued invoice. So starting from the newest to the oldest.