See Parallels Forums "Quickbooks Desktop no longer working after 26.1.2 upgrade"https://forum.parallels.com/threads/quickbooks-desktop-no-longer-working-after-2...
Unfortunately, the report you suggested will not catch all credits because you are missing G/L journal entries that can also create such credits. The better way...
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/...