EFTPOS Lockbox Refund

Hi, When taking payments by Online Banking Portal (like EFTPOS Terminal) and the Bank sends daily file which creates receipts via Lockbox in AR.

When refunds are made back to the original Card the amount comes in the Lockbox file as a negative. How do we create the appropriate transaction entry in AR?

Note that the amount has already been paid back so we don't want to apply refund to the invoice and create a dummy payment.

Also note that Lockbox creates a Negative Misc Receipt which needs to be Auto Reconciled in Cash management.

The Original Invoice had been paid and matched. Is there any any manual workaround or standard functionality that can cater for this?