A user may inadvertently modify the bills, causing them to unlink from the associated purchase orders, kstewart.
Let's verify them using the Audit trail to see if this is the case. Here's how:
- Go to Reports.
- Choose Accountant and Taxes.
- Select Audit Trail.

- Customize Report.
- Under the Display tab, choose the specific data you want to see in the columns.
- Click Ok.

After confirming that no one has modified the bills, we can use QuickBooks' built-in tools, such as the Verify and Rebuild Data tool, to fix common issues within the company file.
Please don't hesitate to share any other questions in the comments, and we're here to assist.