Used for: excluding or detecting invalid GTINs or EANs
Used in: "IF"-statements.
A GTINs format is a combination of eight, twelve, thirteen or fourteen digits. The "GTIN is valid" rule checks if this is the case. The "GTIN is not valid" rule checks if the GTIN isn't format conform. This rule can be used to exclude invalid products for marketplaces for which GTINs or EANs are mandatory (such as Amazon).
Note: make sure the field is mapped correctly in Setup > Edit mapping as this rule can only be used for GTIN and EAN fields.