I appreciate you performing the troubleshooting steps, @PC2024. 

Since you're still experiencing the same issue, I recommend reaching out to our QuickBooks Team. They can review your account securely and investigate further to resolve the problem. Here's how you can connect with them:

1.  Click the Help menu in the upper-right-hand corner.
2. Type in Talk to a human, then press Enter.
3. Select Contact Support Team.
4. Type again Talk to a human and click Contact Support Team.
5. Choose a way to connect with us.

You can also run the  to see the basic summary of all unfulfilled purchase orders, including the vendor names, delivery dates, and open balances.

Additionally, you can run the Purchase Order report in QuickBooks Online to get a basic summary of all unfulfilled purchase orders, including vendor names, delivery dates, and open balances.

Feel free to reach out if you need more assistance with entering purchase orders in QuickBooks Online. We're always available to help.