On a customer account where all the invoices sent to that customer are displayed there should be an option to display the details of the invoice, so what the invoice was for. As at the moment if you want to see what the invoice was for you have to click on each individual invoice. The old Sage used to show this detail. it could be made as an option so that you could have it on if you wanted but take it off if you didn't. like the little setting s option of the customer home page where you can opt to display the customers phone number, email etc.tc or you can hide it if it's not needed.