The oral hearing is intended to give the parties the opportunity to raise objections – i.e., to claim that their subjective public rights are violated by the project (e.g., odor nuisance from industrial plants). However, these objections must be raised in a timely manner. Timely means that they must be lodged no later than the day before the start of the oral hearing during office hours or orally during the hearing.
Timeliness is particularly important because otherwise party status is lost – this is also referred to as preclusion. However, the prerequisite for the loss of party status is proper summons. So if a party has not been personally notified or double notification has not taken place, the preclusion consequences cannot occur.