(16)A single contract involving successive operations or separate operations of the same nature performed over time may be subject to different legal treatment in the different Member States, but it is important that this Directive be applied in the same way in all the Member States. To that end, it is appropriate that this Directive should be considered to apply to the first of a series of successive operations or separate operations of the same nature performed over time which may be considered as forming a whole, irrespective of whether that operation or series of operations is the subject of a single contract or several successive contracts.