1. On the basis of the authorisation, the competent authorities shall issue the principal with one or more comprehensive guarantee certificates or guarantee waiver certificates, hereinafter referred to as certificates, drawn up in accordance with Appendix III to enable principals to provide proof of a comprehensive guarantee or guarantee waiver.
2. Such certificates shall be presented at the office of departure. Particulars of the certificates shall be entered on transit declarations.
3. The period of validity of a certificate shall not exceed two years. However, that period may be extended by the office of guarantee for one further period not exceeding two years.
