Article 16
Without prejudice to any powers conferred on it under, and pursuant to, the Community Customs Code, a Member State may also, for a period not exceeding the periods referred to in paragraph 4, suspend the process of export from its territory, or, if necessary, otherwise prevent the dual-use items listed in Annex I which are covered by a valid export authorisation from leaving the Community via its territory, where it has grounds for suspicion that:
relevant information was not taken into account when the authorisation was granted, or
circumstances have materially changed since the grant of the authorisation.