The exchange rate conversion mechanism is used when a Commercial Invoice needs to be output in a different currency. On the shipping document details page, set up the conversion by specifying: target currency, exchange rate value, rounding method (round half up / round down / round up), and decimal precision. For example, if a PI is priced in USD but the buyer needs a Commercial Invoice in TWD, you can set up the exchange rate to automatically convert. The system also supports using different exchange rate settings for "shipping document copies".