Vendor Credits

@hockeywolf 

Run an A/P Aging Detail report, then click the open balance total for that vendor.  That should show you all open A/P.  The negative amounts are credits.  Do you see them on that report?   

I wish I could say that cleared it up, but it shows a payment from 2021 (which had been cleared) resulting in a credit, even though the payment and invoices were balanced. In addition, when I do an audit history on that transaction it shows that it was edited on the day we moved to QBO by "Import Administration."

A vendor credit is created whenever there is a transaction that reduces the Accounts Payable.  While this can come from a Bill Credit, it can also come from a G/L journal entry (or equivalent such as a zero amount check with paired accounts one of which is an Accounts Payable account).  So the easiest way to find all vendor credits in QuickBooks Desktop is to run the "Vendors & Payables - A/P Aging Summary" report where you Customize Report and in Filters set Amount to <= 0.  This will show all transactions with a negative amount (i.e. reducing) the A/P account.  If you click on the Total for a particular vendor in that report, you will see the detailed (each negative) transactions that led to that total.

Of course, since you've moved to QuickBooks Online, it doesn't have the same rich customizable reports as QuickBooks Desktop so I don't know if there is an equivalent way for you to get this information.