QB Issue Resolution:

First, let’s pull up a Customer Balance Detail report to trace which payments are not linked to your invoices. Here’s how it is done:

  1. Go to the Reports tab.
  2. Choose Customers & Receivables.
  3. Select Customer Balance Detail.
  4. Click the Customize Report button.
  5. In the Columns section of the Display tab, add the Debit and Credit columns.
  6. Go to the Filter tab and choose the customer or job you’d like to view.

Once identified, simply open the invoice then manually apply the credits. You can also write off the customer balance by following the steps provided in this article: Write Off Customer Balance.

 

You can also check out this related article to know more about transferring customer credits in QuickBooks Desktop: Transfer Customer Credit From One Job to Another

Resolution for Issue 'Customer refunds' available: Yes (Solved).
Source: Intuit Community forum.

Customer refunds: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for balance detail report
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Error Recovery for balance detail report [Canada]
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