So I prefer to use a hyphen system e.g. HY-2019-001 for example which worked fine for a couple of invoices.
However I accidentally missed the hyphen and created a HY-2019002 invoice and saved it and now the invoicing screen point blank prevents me from typing any hyphens in the number once I try and re-type it by adding one in the correct place. If I remove all the characters to try and type it in from scratch it stops any hyphens at all - looks like a bug perhaps?
So now I’m stuck with an invoicing sequence which prevents me getting back to my desired format. Any idea?