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I can think of one thing, Louis524.
The refund wasn't linked to the customer's overpayment. Let me help you fix it.
First, let's make sure the check is categorized to Accounts Receivables. This way, you can link it to the overpayment. Here's how:
Next, link it to the overpayment. Here's how:
Let me share the article on how to handle a customer credit or overpayment in QuickBooks Online for additional reference.
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