32It follows from the foregoing that the concepts of force majeure and unforeseeable circumstances contain an objective element relating to abnormal circumstances unconnected with the trader in question and a subjective element involving the obligation, on his part, to guard against the consequences of the abnormal event by taking appropriate steps without making unreasonable sacrifices. In particular, the trader must pay close attention to the course of the procedure set in motion and, in particular, demonstrate diligence in order to comply with the prescribed time-limits.