advance declaration requirement
Singapore customs, [Reminder on advance permit declarations for imports from Iran ](https://www.customs.gov.sg/-/media/cus/files/about-us/national-single-window/ca-requirements/circular_reminderonadvancepermitdeclarationsforimp.pdf)(24.7.2019).
Switzerland has a treaty with the EU regarding customs security and an easing of customs restrictions, thanks to which goods from Switzerland have been exempt from the advance declaration requirement for imports into the EU since 2011.