Welcome and thank you for posting here on the Community page, @accounting334.

Yes, you can delete the incorrect entry for your vendor payment. This can be done by removing/deleting the transactions through the Bill.com.

On the other hand, you can read this article for additional reference about entering and paying bills in QuickBooks Online.

Let me know if you have any other questions by adding a comment below. I'm a few clicks away to help. Have a great day!