In the Currencies window, enable the foreign currencies you want to use. See: Currencies Window, Oracle General Ledger User's Guide.
Choose your ledger currency in the ledger window. See: Defining Ledgers, Oracle General Ledger Implementation Guide.
Define your Payables options in the Payables Options window. See: Payables Options.
Enable the Use Multiple Currency Payables option.
Enable the Require Exchange Rate Entry Payables option for foreign currency invoice entry. (optional)
Enable the Calculate User Exchange Rate Payables option for foreign currency invoice entry. (optional)
Define a default Exchange Rate Type which defaults to all foreign currency invoices. (optional)
Define the Realized Gain/Loss Accounts and Rounding Accounts when you define Financials Options or during bank setup.
Define Conversion Rate Types. See: Defining Conversion Rate Types, Oracle General Ledger User's Guide.
Enter Daily Exchange Rates. See: Entering Daily Rates, Oracle General Ledger User's Guide (optional)
Define foreign currency bank accounts and payment documents. See Defining Banks, Oracle Cash Management User Guide.