I'm glad to hear back from you, anthowil.

Did the error ask you to fix other linked transactions to the contractor payment you'll want to void or delete? 

There are times that internet cache files stored in the system can cause unexpected behavior within the regular browser. It can be the reason why they're unable to successfully delete or void the payment. We can do some basic troubleshooting that can fix this issue.

To start, you can try deleting or voiding the transaction using a private (incognito) browser to verify if the concern is cache-related. You can use the shortcut keys to open one:

• Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

If you're able to delete the transaction just fine, you can clear the cache in the regular browser or try using a different supported browser if the error persists. 

Here's a link where you can run reports that will help you keep track of your contractor payments: Create and file 1099s using QuickBooks Online.

I'll be here to help you if you have other questions, and any additional information on the exact error you're prompted with is much appreicated. Take care!