QB Issue Resolution:

you recorded it once but they cashed it twice.  you have to record the duplicate.  do this by writing a check (leave the check # blank) and use “Payables” or “Accounts Payable” as the expense account.  This will set a credit with the vendor.  When the bank refunds the money, enter a credit from the vendor for the same amount.  the next time you have to pay a bill for the vendor, click on the credits button to apply the credit to the payable.

Resolution for Issue 'We wrote a check to a vendor, which the vendor cashed twice. The bank is trying to refund us since it was their error. How should I account for this in QuickBooks?' available: Yes (Solved).
Source: Intuit Community forum.

We wrote a check to a vendor, which the vendor cashed twice. The bank is trying to refund us since it was their error. How should I account for this in QuickBooks?: 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.

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