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I appreciate you for bringing your concern to our attention, Alex.
This error can occur if you have entered an amount and doesn't have an associated ACCOUNT or PRODUCT/SERVICE. Make sure all the line items on your purchase order.
We can also do browser troubleshooting steps to get rid of any cache-related issues.
We can use a private browser since it doesn't store cache files. Using a different supportive browser can be a good alternative, too. Each browser stores different sets of cache files.
Then, try logging in to your account and creating a purchase order. If you can create the purchase order successfully, we can clear the cache storage of your regular browser.
Otherwise, I'd recommend contacting our QuickBooks Customer Care Team. They'll be able to investigate and do further troubleshooting steps about this.
Feel free to leave a reply if you have other concerns.