Thank you for notifying us of the issue you've encountered when adding sales receipts in QuickBooks Online (QBO), Luke.
Can I ask if you're creating sales receipts by clicking the +New button or if you're adding them from the For Review tab on the banking page when you're prompted with the error message? For now, I'm here to provide browser troubleshooting steps to fix the error message you encountered, as this could be a temporary browser problem.
Sometimes, stored browser cache can interfere with QBO's performance. I recommend signing in to your account through your browser's incognito mode and adding the sales receipts. Here's how:
If adding sales receipts in your browser's incognito mode fixes the error message you encountered, proceed to clear your browser's cache. This process will remove and fix specific issues and help the program run optimally. Additionally, you can use other devices and supported browsers to ensure everything works as expected.
For future reference, let me add this article about categorising transactions in QBO: Categorise online bank transactions in QuickBooks Online.
We'll be here in the Community if you have further questions about adding sales receipts in QBO. We'll do our best to assist.
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