In doing so, you may also wish to change the title of the column in the Admin area, billing, invoices, unpaid, from 'Total' to a more relevant 'Amount Due' or 'Balance Due' (and a suitable French language translation for the French language file). As an Admin when I see 'Total' and an amount, I assume the customer owes that amount, when they might only one one cent or some other amount in between that and the original amount due to one or more credits on the account, etc. Customers experience similar confusion, at times then leading them to pay the full original amount, not the amount due, which then sets up a cycle of over payments and confusion and at times bad feelings.