Contractual terms, even though they constitute a factor to be taken into consideration, are not decisive for the purposes of identifying the supplier and the recipient of a ‘supply of services' within the meaning of Articles 2(1) and 6(1) of Sixth Council Directive 77/388/EEC of 17 May 1977 on the harmonisation of the laws of the Member States relating to turnover taxes - Common system of value added tax: uniform basis of assessment, as amended by Council Directive 2000/65/EC of 17 October 2000. They may in particular be disregarded if it becomes apparent that they do not reflect economic and commercial reality, but constitute a wholly artificial arrangement which does not reflect economic reality and was set up with the sole aim of obtaining a tax advantage, which it is for the national court to determine.