@Jack, In a routed transaction, both must occur. The FPPI must facilitate the export and then authorize the USPPI or a U.S. agent to file the EEI. If the FPPI has not authorized a filer, however, that does not mean it is not a routed transaction.
It is just a proof of insurance. Additional Insured: The main contractor is named as an additional insured on the certificate of insurance and is actually given coverage, and has rights under the sub-contractors or vendor's, the Named Insured policy in the event of a future claim.
When it comes to adding additional insureds to policies, it is important to understand the relationship between the two entities and be certain that it makes sense before doing so. Adding the additional insured endorsements does open the policy up to potential to be brought in on more lawsuits.