Understanding Monetary Accounts
For most general ledger accounts, you want the system to accept transactions in any currency. This is accomplished by not assigning a currency code to the account.
For those accounts in which you want to accept only transactions in a specific currency, you must assign a currency code to the account. These accounts are called monetary accounts. Monetary accounts are usually bank, or cash, accounts
For example, a Japanese organization has a company with a currency that is Japanese yen, and that company has a bank account that is Canadian dollars (CAD). If you assign CAD as the currency of that account, it becomes a monetary account and the system accepts only transactions in that currency.
The system stores currency codes for monetary accounts in the Account Master table (F0901).