Hi - I recorded a customer's returned check, per the instructions in QBO. He provided another check. The invoice shows closed, but the statement says he owes. Help?

I've got your back in handling those transactions in QuickBooks Online, @tdemarse.

Suppose you've already given a credit memo to your customer, which shows on the statement. In that case, we can create a check affecting the Accounts Receivable (AR). This way, we can give back the credit to your customer. 

Here's how:

1. Click the + New in the left panel and choose Check.
2. Select the customer's name.
3. From the Category column, choose Accounts Receivable.
4. Enter the Amount and other necessary details.
5. Hit Save and close.

Once done, we can apply the check and credit memo through the receive payment window. Please see the sample screenshot below for your reference:

To know more about this process, we can refer to this article: Record a customer refund in QuickBooks Online. In the same link, we can find other ways to handle customer refunds based on scenarios.

When everything is all set, you'll want to check out this helpful reference to further guide you in organizing your transactions flawlessly: Categorize and match online bank transactions in QuickBooks Online.

In case you need more help supervising your customer credits or refunds. I'll always be ready to help you the best way I can. Take care always.