Even if the periods provided for in articles 354 and 354a have elapsed, omissions or deficiencies in taxation constituting offences whose purpose or result is the non-recovery of duties or taxes, revealed by legal proceedings or by proceedings before the administrative courts, may be remedied by the customs administration up to the end of the year following the year of the decision that closed the proceedings and, at the latest, on expiry of the ten years following the date on which the taxation is due.