DFS may only be used for the purpose authorised and must not
be removed from the place authorised to receive them. They may only
be delivered from a warehouse to a person authorised to receive
them. There is the possibility that a delivery may need to be
returned to the warehouse for some reason, eg wrong product, double
delivery, etc. This is permissible as long as the trader can
provide the appropriate documentation as proof of the delivery and
a proper audit trail exists.