Multiple Packaging Material within a HU?

Hi,

We have a scenario where we produce a Product onto small "display" pallets. Two of these display pallets are then placed onto larger "slave" pallets purely for storage in the Warehouse. When picking for an Outbound Delivery they are picked and dispatched as "display" pallets.

I have tried playing around with the packspec to accommodate this but have been unable to achieve the desired result (if it is possible?).

Has anybody come across a method to make this kind of scenario work?

Thanks

Graham