it would be nice and perfect if the line description in the invoice show if the invoice is for Renew or Registration/Activation (First Order).
we have a lot of resellers and a lot of them request this, because a lot of invoice and they should log to the system to see if is a new activation or is for a existing service (renew), they claim because other providers send them invoice that show that, i don't know if the other providers has WHMxx or other billing software . but i found the idea is very helpful in term of management .