Voiding both the payment and voucher on a garnishment

We have an old outstanding garnishment payment that we're reclassing to unclaimed property.  The voucher subject to the garnishment was run through the R04580-Calculate Withholding process to create the line of the voucher to be paid to the recipient of the garnishment.  The payment was voided but when we attempt to void the associated line of the voucher we get a message "Voucher Not Eligible for Deletion".  I know that we can create a debit memo and then run a manual zero dollar payment to clear the open line item and debit memo, but I was wondering if anyone else has come