SECTION 311

With the exception of those grounds for nullity referred to in article 299 (2) above, the grounds relating to the form or merits, against the procedure preceding the contingent hearing shall be raised, under pain of forfeiture, by way of a statement annexed to the terms of reference not later than five days before the date fixed for hearing. Where they are allowed, the action may be recommenced from the last valid act and the time limits for accomplishing the subsequent acts shall be computed from the date of the notification of the decision which pronounced the nullity. Where the grounds are dismissed, the action shall continue from the stage where the proceedings had been stopped.