@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.
Blanket Additional Insured Clause. Also known as an automatic additional insured clause, this language in your business liability policy provides liability coverage for subcontractors on your project that you are contractually required to add to the policy.