Part invoice Purchase Orders

We have many Purchase Orders, that have been received, but only part invoiced, we believe this is down to when we first started using Nav & did not match every Order to an Invoice. We are happy that the Orders have been paid & what to removed the PO's from the list view, apart from Manually opening each one to check & then archive & then delete, is there a better way of dealing with this?

The Delete Invoiced Purchase Orders Batch Job does not work as the Orders are not fully invoiced.

Any hep gratefully received.

Nav 2009 R2