Currency conversion: being able to see original amount paid and in another currency

This would be really useful for travel purposes. Right now you are forced to "lock" into a currency and after the conversion you can't see the actual amount you paid in another currency, which is unhelpful. Also the inability to switch currency easily means if you are travelling in Europe or multi-country, the app is less useful. It would be better if you can have a home currency, but allow multiple foreign currencies at the same time in the same budget book, and the app remembers each transaction's chosen currency until you change it, while showing you both how much you spent in x and how much it means in y.