Section 5. The provisions of this article shall not affect bilateral or multilateral agreements concerning soci

5. The provisions of this article shall not affect bilateral or multilateral agreements concerning social security concluded previously and shall not prevent the conclusion of such agreements in the future. Article 34 A diplomatic agent shall be exempt from all dues and taxes, personal or real, national, regional or municipal, except: (a) indirect taxes of a kind which are normally incorporated in the price of goods or services; (b) dues and taxes on private immovable property situated in the territory of the receiving State, unless he holds it on behalf of the sending State for the purposes of the mission; (c) estate, succession or inheritance duties levied by the receiving State, subject to the provisions of paragraph 4 of article 39; (d) dues and taxes on private income having its source in the receiving State and capital taxes on investments made in commercial undertakings in the receiving State; (e) charges levied for specific services rendered; (f) registration, court or record fees, mortgage dues and stamp duty, with respect to immovable property, subject to the provisions of article 23. Article 35 The receiving State shall exempt diplomatic agents from all personal services, from all public service of any kind whatsoever, and from military obligations such as those connected with requisitioning, military contributions and billeting. Article 36 5. The diplomatic courier, who shall be provided with an official document indicating his status and the number of packages constituting the diplomatic bag, shall be protected by the receiving State in the performance of his functions. He shall enjoy personal inviolability and shall not be liable to any form of arrest or detention.