Error setting up progress payments in Quickbooks online

It's a pleasure to have you in the Community, @apolloenergies. Let's work this out so you can finish setting up a progress invoice in QuickBooks Online (QBO).

A possible reason the error happened on your end while setting up the progress invoice is that there are conditions or steps that you haven't met or performed. That said, I recommend double-checking your setup. I'd also appreciate it if you could attach a screenshot. This way, I can review and determine the root cause of the issue.

Now, you'll also want to ensure that the browser you're using doesn't have anything to do with the error message you received. To do that, we can perform basic browser troubleshooting to clear your browser's temporary internet files, such as the cache and cookies.  To begin, you can use the following shortcut keys to access a private browser:

• Chrome: Ctrl+Shift+N
• Firefox: Ctrl+Shift+P
• Safari: Command+Shift+N

Once you're in, try to set up the progress invoice again. If it works and you're able to get through, you can proceed to clear your browser's cache. Refer to this article for the steps: Clear cache and cookies to fix issues when using QuickBooks Online.

You can also use other compatible browsers if the issue persists. Refer to this article to see the list of compatible browsers in QuickBooks Online: Other browsers.

Additionally, here's an article in case you'd like to modify how your sales form looks in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.

You can also check this article to learn more about customizing reports: Customize reports in QuickBooks Online.

Don't hesitate to post here again if you need further assistance setting up progress invoice in QuickBooks. You can also post here again if you have any additional QuickBooks-related concerns. I'll be here, ready to help you. Take care!