I’d be delighted to add more information on how to remove your duplicate vendor payments.
Yes, you can go back to the check that you have manually created to pay your vendor and delete it.
On the other hand, @Rustler is correct! If you have connected the bank you use in paying your vendors with QuickBooks, the system tries to match your downloaded transactions to any manual entry you have in your Register. This is to avoid creating any duplicates.
If the system can’t locate any matching transaction, here’s how to review:
Open your register.
Choose the appropriate transaction.
Click Select Bills to Mark as Paid from the Actions column.
On the Transactions Details window, select the vendor name and the date.
Look for the appropriate for the selected vendor in the Open Bills section.
Click Add to QuickBooks.
That should do it! Let me know if you other questions about managing your vendor payments. I’m always here to help.