I'm currently having this same issue. I received a refund of $50.99 to my bank account from Amazon for a purchase I made prior (the refund  amount was not the same as the expense amount because the expense was for various products/items and I only returned one of them).

I followed the steps mentioned to create a bank deposit and match it to the transaction of $50.99 coming into my account in the bank feed. However, when I go the the vender/supplier page, this amount of $50.00 shows at open and overdue. What should I do now?

I tried creating a "dbt refund" category in the chart of accounts but there no detail type for any account (expense or income) that matches this kind of transaction.