While creating invoices, credits or quotes for a foreign currency contact, the Currency and Exchange rate display above the invoice details. The ECB exchange rate automatically pulls through, but you can overwrite it.
If you convert a quote or draft invoice, the original exchange rate applies unless you overwrite it.
For more information on creating these transactions, read:
You can only create foreign currency Customer Receipts and Supplier Payments manually. Bank feeds and bank statement imports aren't available for foreign currency transactions.
When creating these transaction types, the ECB exchange rate automatically pulls through or you can overwrite your own.
For more information on creating payments and receipts, read: