Thanks for providing us with more details about your concern, @cfoland.

A person could've paid the bill without linking it to any transaction by entering the payment value directly into the Amount Paid field. Additionally, there's likely no entry displayed in the window due to its deletion.

To rectify the situation, I recommend running the Transaction List by Vendor report to trace the entry associated with the payment. Here are the steps:

1. Navigate to the Reports menu and select Vendors & Payables.

2. Open the Transaction List by Vendor report.

3. Click on the Customize Report button and go to the Display tab.

4. Ensure the Report Date Range is set correctly. Then, enter Billing Status on the Columns search field and tick the checkbox.

5. Head to the Filters tab, then type and select Transaction Type in the Search Filters field.

6. Under the Transaction Type dropdown, choose Multiple Transaction Types, then select Check, Bill, and Bill Payment.

7. Hit OK twice.

Moreover, you can review transaction changes in the audit history. This way, you'll be able to find out who made the modifications, when they were created, and what they were.

In case you want to set up an automatic recurring payment, check out this article for guidance: Create an automatic recurring payment (check) to a vendor.

Feel free to swing by this thread if you have more questions or need help with your bill payments. We're readily available to assist you. Have a great day ahead!