Thanks for bringing this particular message to my attention, @michelle-cafefus.
Currently, we have an ongoing investigation about getting an error message upon saving an invoice into QuickBooks Online. Our product engineers are actively investigating to have a permanent fix.
I want to ensure you're in the loop about the investigation's status and its resolution. With this, I recommend contacting our Customer Care Team so you'll receive email updates. Please provide the INV-51508 to our representative as your reference. You can also check out our support hours before getting in touch with them.
Here's how to reach us:
- Sign in to your QuickBooks Online company.
- Click the Help icon in the upper right of the screen.
- Select Contact US on the pop-up.
- Enter what you're needing assistance with in the How can we help? field and choose Continue.
- Click Get a callback.
- Enter your contact information.
- Select Call me.
I'm also adding here some resources about managing your transactions and how you enter it in QuickBooks:
We appreciate your patience as we work through this. If there's anything else I can do for you, please let me know. I'll be around to help you out.