QB Issue Resolution:
Use enter credit card charges/credit instead of enter bills/credit.
Enter Credit Card Charge Refund/Credit: Go to Banking > Enter Credit Card Charges. Select the Refund/Credit radio button and enter the receipt that you have for the refund. This transaction should be a mirror-image of the original purchase, meaning that you select the same expense / asset accounts and have the same tax codes and amounts.
Resolution for Issue 'How to enter Vendor refund to credit card on outstanding credit memo' available: Yes (Solved).
Source: Intuit Community forum.
How to enter Vendor refund to credit card on outstanding credit memo: 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 Credit Card
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Error Recovery for Credit Card [Canada]
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