This requirement is regulated by the Rules of Procedure Concerning the Usage of the Single Administrative Document in the Customs Clearance Process (Pravilnik o obrascima za provedbu Carinskog zakona - Official Gazette 147/1999).
这项规定是以《结关过程中使用单一行政文件的规程》(官方公报第147/1999号)为依据的。