Define my own date format for numbering

Hello and sorry if this question has already been answered. I didn’t find the solution.

I am using the last 2 digits of the year and the month for my bills. e.g. RE-2212-counter.
In PGP this would mean the date format would be ym.
How do I set this up in settings?

My second question is similar: What do i have to set up to have something like “Leistungszeitraum: :MONTH-1” on my bills?

Thanks for your great software.


The pattern would be RE-{$date:ym}-{$counter}

One option is to add it to the default invoice terms on Settings > Company Details > Defaults.

That did the trick, thanks

Should I open another topic with my 2nd question?