Hello, paul82.
We've received reports of similar cases regarding the error you're encountering.
I recommend contacting our support team. By doing so, they can add you to the list of affected users and receive updates as soon as they become available.
Here's how:
- Go to the Help menu at the upper right.
- Click the Search tab.
- Click on Contact Us at the bottom part.
- Enter your concern in the What can we help you with? box.
- Click Continue.
- Select Chat with us or Have us call you.
I'm sharing a short video and a step-by-step process if you want to customise your sales forms in the future: Customise invoices, estimates, and sales receipts in QuickBooks Online.
We greatly appreciate your patience and understanding as we actively work towards resolving this issue.