Invoice number

[Mark]

There are several posts about this already present on the forum. You can use the search function in the top right corner (mandatory as stated in the Forum’s FAQ/Rules). In one of those posts there’s this answer by the developer:

Series of Number at printed documents

I’m not against this feature. If you want static prefix on all invoices, it will be possible. Footers will soon support ability to “inject” variables. Once that is done, I will implement ability to have custom document headers which will work similar to footers. That will conclude need for custom themes which are now obsolete due to being too complex for vast majority of users.