Article 17 2.

In the case of an essential change as referred to in paragraph 1, a new notification shall be submitted, unless all the competent authorities concerned consider that no new notification is required and inform the notifier thereof. The competent authorities shall inform the notifier as soon as possible but no later than five working days after receipt of the information pursuant to paragraph 1. A planned shipment shall not take place until the notifier has been informed by the competent authorities concerned. Where a shipment has already started, the notifier shall ensure that the consignment is halted as soon as practicable until the notifier is informed by the competent authorities concerned whether a new notification is required.