1. Before entering an alert and when extending the period of validity of an alert, Member States shall determine whether the case is adequate, relevant and important enough to warrant an alert in SIS.
2. Where the decision to refuse entry and stay referred to in point (a) of Article 24(1) is related to a terrorist offence, the case shall be considered adequate, relevant and important enough to warrant an alert in SIS. For public or national security reasons, Member States may exceptionally refrain from entering an alert when it is likely to obstruct official or legal inquiries, investigations or procedures.