"Transactions can have only one foreign currency at a time" When I try to interbank transfer to another bank, Every time shows this message, I tried to fix the problem.

Hello @accounts341,

Ideally, transfer funds between two accounts can only be done if both accounts have the same currency. But there are times that your browser is full of frequently-accessed page resources, thus causing websites, like QuickBooks Online (QBO), to act weirdly. This can be the reason why you received the said error message.

Let's consider logging into your QBO account using a private browser so we can isolate this issue. To do so:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

If this works, you can clear your regular browser's cache so the system can start fresh. But if you get the same results while using a private browser, use a different browser app instead.

Lastly, here are articles you can read for ideas about how you can review a transaction in your account register: Find, review, and edit transactions in account registers

If there's anything else that I can help you with, let me know in the comments. I'll be here to help.