23The Court takes the view that a candidate in a competition must not be deprived of the right to challenge all the elements, including those defined in the competition notice, comprising the justification for the individual decision concerning him taken on the basis of the conditions laid down in the notice, inasmuch as only the decision applying them affects his legal position individually and enables him to ascertain with certainty how and to what extent his personal interests are affected. The principle applies in the same terms where, as here, the conditions for admission set out in the notice leave no margin of discretion to the selection board and pose no problems of interpretation as regards their application, having regard to the circumstances of the case.