Where it is necessary to establish a customs value for the purposes of Articles 28 to 36 of the Code, a declaration of particulars relating to customs value (value declaration) shall accompany the customs entry made in respect of the imported goods. The value declaration shall be drawn up on a form D.V. 1 corresponding to the specimen in Annex 28, supplemented where appropriate by one or more forms D.V. 1 bis corresponding to the specimen in Annex 29.