When you are importing or exporting goods internationally, you have to comply with the different customs regulations. There are several texts controlling trade within the European Union, some of them allowing tariff preferences when the right documents and certificates are available for the traded goods.
One of the mandatory documents needed for the international trade of goods is the long-term supplier declaration. It attests to the origin of the goods and is necessary for the buying companies documentation, being their movement certificate or their invoice declaration.
