Automatically update exchange rates for a base currency:

If the Currency Exchange Rate Integration feature is enabled, you can indicate on a currency record that its exchange rate with each base currency should be automatically updated each day. 

To automatically update exchange rates for a base currency:

1. Go to Lists > Accounting > Currencies.
2. Click the name of a currency.
3. On the Currency page, if the Automatic Update box is checked, NetSuite updates the exchange rate between this foreign currency and the base currency.
4. On the record of a currency that has been defined as a base currency, the Update Time Zone field determines the time of the daily automatic exchange rate updates. These updates occur at 6 a.m. in the selected time zone. The default is U.S. Eastern time. You can select another time zone. If this currency is a base currency, the read-only Is Base Currency box is checked. If it is not a base currency, the box is clear.
5. Click Save.