The Convention on a common transit procedure
Article 293
1. Where the holder of the goods uses the common transit procedure, paragraph 2 of this Article and Article 189 of Delegated Regulation (EU) 2015/2446 shall apply. However, goods circulating within the customs territory of the Union shall be deemed to be placed under the Union transit procedure in accordance with Article 1(2) of the Convention on a common transit procedure. 2. Where the provisions of the Convention on a common transit procedure apply and Union goods pass through one or more common transit countries, the goods shall be placed under the internal Union transit procedure as referred to in Article 227(2)(a) of the Code, except for Union goods which are carried entirely by sea or air.