My supply of US dollars to exchange at a reasonable rate is getting a little low, so I went to the ATM to top up at the hopeless official rate using my Australian Visa debit card. No matter what combination of buttons I push, I always end up at a message say "You Have Entered an Invalid Amount" even if I only select 100 pesos. Am I doing something stupid, or is there a general issue with ATMs? I can use the same card to pay for things in restaurants, so the card isn't broken.
thanks

