We're delighted to have you here today, @FoofSh. We have information on how to get through this and enter a bill for your supplier inside QuickBooks Online (QBO).

Reading your post, it looks like the item you've added to your bill has the latest date, while the transaction you're trying to enter is backdated or old. In this case, you'll want to review your inventory and ensure its date is closer to what you have inside the bill. We'll be happy to input the steps below:

1. Access your QuickBooks Online company.
2. On the top-right corner, click the Gear icon.
3. Select Product and Services.
4. Locate the item or product and then click Edit.
5. In the Quantity on hand section, click Starting value.
6. Click Got it! and then edit the date.
7. Once done, click the Save and close button.

This should help you get rid of the prompt you received when entering a bill. 

In addition, we recommend visiting these articles to help you manage expenses, and learn more about modifying and adding more details to a report inside QBO:

• Enter and manage expenses in QuickBooks Online.
• Customise reports in QuickBooks Online.

We look forward to having you here again if you need assistance managing bills or have any additional concerns related to QuickBooks, @FoofSh. Feel free to visit us anytime. Keep safe.