Gosh, is this so? Why not? Many of us do cross border business. The Client and Invoice details require COUNTRY in the address and, often a foreign currency.
I thought the Quicken rebuild of long ago would take this need into account.
In Q, both QUS and QCan, only a single currency can EVER be in a Q account. SO, to have an invoice account in another currency, you'd need an additional invoice account, if that's possible… which I don't know.