My tried and tested settings for invoice format.
- Billing Enablement – Yes
- Tax split allowed – No (In case of non-VAT payer)
- Allow product image on invoice is set
- Invoice prefix – is a prefix before the invoice number
- You can also add the current year before the invoice number automatically, so that each subsequent invoice starts with this number.
That's it, invoices are set up. If you don't like the original look and functionality, I recommend the module Valasinec – Modul Faktura, Dobropis a dodací list
