38It must be made clear in this context that the decision determining the pension rights of Members who belong to the additional pension scheme is not only a mandatory decision, in that the administration of the Parliament has no discretion when determining the pension rights, but is in fact exclusively declaratory in nature with regard to the content of those rights. Indeed, the wording of Article 1(1) of the Rules of 12 June 1990, namely that ‘… after ceasing to hold office, Members of the European Parliament who have paid … contributions to the [additional] pension scheme for at least two years shall be entitled to a pension for life payable from the first day of the calendar month following the date when they reach the age of 60 years’, can only be interpreted as meaning that the pension rights of Members are automatically due to them by the mere application of the Rules of 12 June 1990 as soon as the conditions specified therein are met. In such circumstances, the decision by which the Parliament determines the pension rights of a Member who belongs to the additional pension scheme merely has the effect of informing that Member of the scope of his pension rights, thus affording him the opportunity, in the event of a difference of opinion as to the exact content of those rights, to have the Courts of the European Union review the application of the Rules of 12 June 1990 and to establish within the administration the payments to be made on the basis of those rights.