''You can only use one foreign currency per transaction'' keeps popping up when i try to create an expense. I have multi currency and never had the problem in the past

Hello pineleaftreeserv, 

Glad to have you join the QuickBooks Community. It's important you're able to use the program and achieve your QuickBooks goals with ease. Rest assured, I'll be happy to point you towards the right path. 

I recommend checking the expense to make sure only one foreign currency is being used. If you're still having issues after verifying that there's only one foreign currency, I recommend clearing cache and cookies on your browser in order to troubleshoot the issue. Clearing cache and cookies helps with fixing most browser issues that may cause the browser to malfunction. You can do this by following the steps in this article: Clear Cache and Cookies. 

Feel free to let me know what happens. I'll be here in case you have other questions.