Why can i not add an expense from the banking screen into supplier balance detail anymore ?

Hello there, @userjacky-belfast.

We can use other supported browsers like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge to isolate this issue. If you're able to add an expense from one of those browsers, you can use that moving forward when you make a transaction.

I'd also attached articles that will help you with managing your banking, sales form, and other related topics. 

• Categorise and match online bank transactions in QuickBooks Online
• Banking
• Help Articles

Please touch base with us if you have any other concerns. I'll always be here to help you.