Thanks for replying to me immediately, @sharieb.

Don't worry, you only need to assign the name of the vendor to resolve the error, and to close the transaction. For the Accounts Payable account, add the name under Customer: Job column. Also, using a different account other than A/P will not allow you to link the check to an existing bill.

Follow this screenshot to see how the entry is done:

Kindly reach out back to me again if you need other QuickBooks help besides this billing concern. I'll be right here to share some assistance always. All the best!