Direct transport or non-manipulation rules
Even if your product is originating (i.e. it meets the basic rules and their provisions), you still need to verify that the product has been shipped from the country of origin and arrived in the country of destination without having been manipulated in another country, apart from the mere operations necessary to maintain the product in good condition.
You will need to check the specific conditions on this point and documentation required to prove compliance with this rule, which are contained in the origin protocol of the relevant trade agreement.