Posting Documents in Foreign Currency 
When you post a document in foreign currency, the system stores the amount in both local currency and foreign currency in each line item.
To specify the foreign currency in the document, enter the currency key in the Currency field in the document header. There are several ways to enter an exchange rate:
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You enter a posting date and the currency code in the document header. The system automatically transfers the exchange rate valid on the posting date. Exchange rates are defined in the system.·
You can also enter the exchange rate directly into the document header via the currency key and exchange rate fields.·
Alternatively, you can enter a translation date in the document header. The system then automatically takes the exchange rate valid on this translation date.The valid exchange rate is the one entered on the posting date or on the translation date, or the rate entered at an earlier time. For example, if you post a document on August 25, but the last exchange rate in the table is on August 22, then the system uses the exchange rate from the entry on August 22.
You can enter the amount in each line item in both local and foreign currency.
You can enter documents in any foreign currency for which a currency key is defined in the system. If you manage a G/L account, such as a bank account, in a foreign currency, you can post documents to this G/L account only in the account currency.
For more information about clearing open items in foreign currency, see the R/3 Library FI General Ledger Accounting, FI Accounts Receivable, and FI Accounts Payable.