For the purposes of establishing the list of gold coins referred to in Article 345 of Directive 2006/112/EC, 'price' and 'open market value' as referred to in point (2) of Article 344(1) of that Directive shall be the price and open market value on 1 April of each year. If 1 April does not fall on a day on which those values are fixed, the values of the next day on which they are fixed shall be used.