When in it comes to origin there is a difference between preferential and non-preferential origin. Preferential origin is important in case of lower customs duties when goods are declared for free circulation. The non-preferential origin is important in all other cases. Those other cases are for example in situations where the determination of anti-dumping duties and othertrade-political measures are applicable.
To conclude if a certain origin may be granted, the declarant shall furnish proof of this in the form of certificates. These certificates are issued only when the goods meet the origin criteria. Origin is an area of the customs legislation that is eligible for mistakes. In a lot of cases, licenses are issued erroneously with all (financial) consequences.