Can be set to 'true' or 'false' and determines whether or not this object can be sold. Obvious enough for BuildingTypes however a little known fact is that, unlike previous C&C games, this defaults to 'false' for VehicleTypes so setting it to 'true' for them allows them to be sold from a Service Depot for half of their initial cost unless you determine the 'refund' by specifying a Soylent= value. NOTE: that ability to sell units from a Service Depot is disabled in Yuri's Revenge V1.001 and later.
