Move Items Reserved to Customer Orders

I would like to peg make-to-order line items on customer orders to the supplying shop orders.  When the shop order is closed and the item is reserved to the customer order line, though, the item cannot be moved in the warehouse.  I understand the argument that if a made-to-order item is ready and reserved, the next logical step is to create a pick list.  For various reasons, however, we do need to move these items.

Is it really not possible to move a reserved item?  Or are we missing something?

Using IFS app 9, update 10.