Article 23 4.

Customs authorities shall verify, in particular, whether in cases of release for free circulation the importer indicated in the customs declaration has quota or authorisations to use quota as required under this Regulation before releasing the goods for free circulation. Customs authorities shall ensure that in cases of imports the importer indicated in the customs declaration, or where not available, the declarant, and in cases of exports the exporter indicated in the customs declaration is registered in the F-gas Portal pursuant to Article 20.