Return to Vendor movement type 122

Hi All

I have the following scenario.

User creates an Inbound Delivery and then posts the document creating a 101 movement.

The user then decides that he wants to return the goods to the vendor for whatever reason

He then processes a Migo transaction and chooses return delivery.

What then happens is that the inbound delivery that was created becomes "open" again. Is there any way of leaving the inbound delivery docment closed?