Hello

It would be useful to insert variables into invoice numbers, to generate invoice numbers based on the date, the client ID, or anything else.

In our firm, we use to generate invoice numbers like this :
F{YY}{MM}{DD}xxxx

F means "Facture"
{YY} is replaced by year on 2 digits
{MM} month with 2 digits
{DD} day with 2 digits
xxxx auto-increment number

For example an invoice generated on Feb. 18th 2021 could be : F2102180045
It's very useful to quickly find an invoice in our registry.

We can also (but we dont use this feature) insert the Client ID, the related Project ID.