Derive Rate Button
The Derive Rate button appears on the Taxes tab on the Invoice Entry form and on the Document Taxes form associated with Payment Entry (for miscellaneous payments), if you are entering tax reporting amounts manually or distributing tax reporting amounts to invoice details.
After entering the taxes and tax reporting amounts for the tax authorities, click the Derive Rate button to let the program compute the exchange rate implicit in converting manually entered taxes from the vendor currency to the tax reporting currency.