There has to be something wrong here,think about it,what if I have to send the same invoice to my customers for a monthly service,price is the same each month,so if I cant change the invoice number then that means I will have to creat a new invoice.What if I have 80 customers who I do a service every month.That means that every month I will have to create 80 new invoices,but they will be the same as last mths except for the date,so not being able to edit the invoice numbers on old invoices is a bit stupid.Someone please correct me if I am missing something.