1. The person liable to pay the excise duty that has become chargeable shall be:

(a) in relation to the departure of excise goods from a duty suspension arrangement as referred to in point (a) of Article 6(3):

(i) the authorised warehousekeeper, the registered consignee or any other person releasing the excise goods or on whose behalf the excise goods are released from the duty suspension arrangement and, in the case of irregular departure from the tax warehouse, any other person involved in that departure;

(ii) in the case of an irregularity during a movement of excise goods under a duty suspension arrangement as defined in Article 9(1), (2) and (4): the authorised warehousekeeper, the registered consignor or any other person who guaranteed the payment in accordance with Article 17(1) and (3) and any person who participated in the irregular departure and who was aware or who should reasonably have been aware of the irregular nature of the departure;