If an ISF is received by CBP with the same Bill Number and ISF Importer Number as one submitted in a previous ISF by a different filer, CBP accepts the duplicate ISF with a warning to let the filer know that a different party previously filed an ISF against the same shipment.

A status message with an S7 disposition code and a “DUPLICATE ISF BY ANOTHER FILER” description will be sent to the initial ISF filer indicating that a duplicate ISF was filed.

CBP expects the parties involved to contact the ISF importer in order to ascertain which ISF is the accurate one.

Failure to do so may incur enforcement and/or compliance actions.