The law in force in the Member State within the territory of which the goods are placed in one of the situations ... shall apply as regards: (a) referral to the authority competent to take a substantive decision and immediate notification of the customs service or office referred to in paragraph 1 of that referral, unless referral is effected by that service or office; (b) reaching the decision to be taken by that authority. In the absence of Community rules in this regard, the criteria to be used in reaching that decision shall be the same as those used to determine whether goods produced in the Member State concerned infringe the rights of the holder. Reasons shall be given for decisions adopted by the competent authority.