(21)Partly completed machinery is a product within the scope of this Regulation which needs to undergo further construction in order to be able to perform its specific application, namely the well-defined operations for which the product is designed. It is not necessary that all requirements of this Regulation apply to partly completed machinery but, in order to ensure the safety of the product as a whole, it is nevertheless important that the free movement of such partly completed machinery be guaranteed by means of a specific procedure.