On the Customer and Vendor cards there are Balance (LCY) and Balance Due (LCY) fields but there is no visibility of Balance in currencies. When talking to a company about outstanding values it helps to be able to easily see on the card the values that are owed in each currency.

You can't guarantee that all transactions are in the same currency as the Currency Code on the Customer card so there needs to be some flexibility about how to present the data. I would suggest a Factbox that groups all the Customer Ledger Entries by Currency Codes and then presents those Currencies with the Balance in separate rows in the Factbox.