getting message that says I can only use one foreign currency per transaction

Although everything appears to be in your local currency, QuickBooks is detecting a second currency assigned to a specific profile or account in the transaction setup.
 

Could you share a screenshot of the error message and the page where it occurs? This will help us identify exactly where QuickBooks is finding the currency mismatch.
 

Also, I recommend trying to recreate the transaction in a private/incognito window or another supported browser to see if the error persists.
 

Narrowing the issue down to either the transaction setup or your browser will help us apply the right fix and get your transaction processed successfully.
 

Feel free to reply with your screenshot, and we'll take a closer look.