regional economic community, levy customs duties on goods originating in one Member State and imported into another Member State. The same prohibition shall apply to goods originating from third States which are in free circulation in Member States and are imported from one Member State into another. 2. The definition of the notion of products originating in Member States and the rules governing goods originating in a third States and which are in free circulation in Member States shall be governed by a Protocol concerning the Rules of Origin. 3. Goods originating from third States shall be considered to be in free circulation in a Member State if (i) the import formalities relating thereto have been complied with, (ii) customs duties have been paid thereon in that Member State, and (iii) they have not benefited from a partial or total exemption from such customs duties. 4. Member States undertake not to adopt legislation implying direct or indirect discrimination against identical or similar products originating from another Member State. Article 34 Internal Taxes 1. During the third stage, Member States shall not levy, directly or indirectly on goods originating from Member State and imported into any Member State, internal taxes in excess of those levied on similar domestic products. 2. Member States, at the level of each regional economic community, shall progressively eliminate any internal taxes levied for the protection of domestic products. Whereby virtue of obligations assumed under a prior agreement signed by a Member State, that Member State is unable to comply with this Article, it shall notify the Council of this fact and shall not extend or renew such agreement when it expires. Article 35 Exceptions and Safeguard Clauses 1. Notwithstanding the provisions of Articles 30 and 31 of this Treaty, any Member State, having made its intention known to the Secretariat of the Community which shall inform Member States thereof, may impose or continue to impose restrictions or prohibitions affecting: 26