European Union – Employment. The Court of Justice of the European Union ruled that European Union law, and, in particular, the principle of effectiveness, did not preclude national legislation, such as that at issue in the main proceedings, making the right of an employee to seek a reassessment of the periods of service which should be taken into account in order to fix the reference date for the purposes of advancement subject to a 30-year limitation period, which had started to run from the conclusion of the agreement on the basis of which that reference date had been fixed or from the classification in an incorrect salary scale (see [37] of the judgment).