Currency rates are used to calculate the right currency amount on invoices, price quotes, supplier invoices and multi-company/currency postings. New currencies are added through Currency definitions.
Currency rates must be manually updated by providing the value in your company’s base currency for, for example, 100 units of each other currency active in your system. To add a currency rate, click on the + button.
Example: if company base currency is USD and 100 EUR = 134.72 USD then 134.72 is to be written as the EUR rate.