Article 5
1. Further to Article 4(1)(b), if a change to a rule may affect the classification of this rule in any other Member State, the Agency shall advise the NSAs of the affected Member States so that they may review the classification. 2. If the Agency becomes aware of a rule proposed to be classified under group B or C by a Member State that in its opinion shall be classified under group A, it shall raise and discuss the matter with the relevant NSA in order that an agreement may be reached on the correct classification. 3. If after discussion with the relevant NSAs the Agency considers that a classification under group B or C by an NSA is not justified according to the provisions of Directive 2008/57/EC and that the classification under group B or C represents an unnecessary requirement or unnecessary verification that has a disproportionate impact upon the cost or timescale for authorisation for placing in service of vehicles, the Agency shall inform the Commission thereof and provide a technical opinion to the Commission and the relevant Member State. 4. Where appropriate, the Commission shall adopt a decision in accordance with the procedure referred to in Article 27(4) of Directive 2008/57/EC. That decision is addressed to the Agency in order to update the reference document and to the relevant Member State with a view to approve the national reference document as provided in Article 4(2).