Deletion of Parked Invoice

Hi friends,

Need your help on the below issue

I am trying to delete a Parked invoice for which the PO has been already archived. Hence system is not allowing to delete the parked invoice

1. Is there any way how to delete the parked invoice?

2. Because when we check in transaction FBL1N(Vendor Line item display) with option "Parked Items" system shows all parked items. But the PO used in those parked invoices are already archived . we do not want to see that parked invoice in FBL1N transcation with option "Parked Items?

Please help

Deva