Thanks for following the instructions provided by my colleague, RBLoom. You're too close to record your customer's refund appropriately.

Yes, you're correct. To complete the procedure, you will need to make use of the Receive Payment feature. This will help you offset your customer's payment. Here's how:

1. Go to the +New button.
2. Select Receive Payment.
3. In the Customer field, select the customer name you used when creating the expense/check.
4. The refund transaction will automatically generate under the Outstanding Transaction section. Put a checkmark and review the amount. 
5. In the Deposited To field, select the appropriate account.
6. Make sure the payment is equal to the open balance. Then, hit Save and close.
   

If you want to double-check the open balance, you can go to the customer profile/transaction. Here's how you could do it:

1. Go to the Sales menu.
2. In the Customers tab, click the customer's name.
3. The open balance and total amount should be zero. Here's a screenshot for additional reference:
   

Know that I am here to support you every step of the way. Don't hesitate to reach out to me if you have any further questions or concerns. Together, we can ensure that you are able to effectively manage your books and feel confident in using our platform.