OK, Well then may I suggest that since the invoice is proof of purchase the local currency should in my humble opinion be put in parenthesis
and the true final amount shown in some place somewhere at the very least
because as it is, my bank could say, I was billed like 31USD, 32USD, 33USD or anything without me being able to notice or verify anything
Thanks for listening and replying (and if I have to say my suggestion elsewhere , please say so )