Multi-currency — What it looks like

A real RowFold grid, captured from a running instance. One price column, four currencies, and a footer that converts what it can and states what it cannot. Nine of ten rows converted into the workspace's currency. The tenth is in yen, no yen rate has been declared, and the total says so rather than quietly leaving it out or counting it at par. The weight and length columns are a separate feature. Plain English: every row shows the money that was actually agreed. Only the total is converted, because a total is the one place a single currency is genuinely required — and if the total is incomplete, it says so on the same line.