I trust you are all doing well.
I am having a bit of an issue with the invoice numbers.
When I "print invoice" in admin panel, it comes up correctly, e.g. Invoice No.: Inv000001
but when they get an email, the invoice number shows like this; Invoice No.: 1 .
Now I'm sure it wont be hard to fix, I just don't know how

Inv is part of my invoice number, and because of the company type I own in South Africa, I have to use it like this: Inv000001
TIA,
Craig
EDIT:
Anyone, please assist, you could also PM me
Version 1.5.0.1
I have not upgraded