1. For the admission to official listing of debt securities issued by undertakings which are nationals of another Member State and which debt securities have a physical form, it is necessary and sufficient that their physical form comply with the standards laid down in that other Member State. Where the physical form does not conform to the standards in force in the Member State in which admission to official listing is applied for, the competent authorities of that State shall make that fact known to the public.
2. The physical form of debt securities issued in a single Member State must conform to the standards in force in that State.
3. The physical form of debt securities issued by undertakings which are nationals of a non-member country must afford sufficient safeguard for the protection of the investors.