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Importer Security Filing 027 – If I use the flexible filing option and later find that the information was correct as entered, am I required to update the ISF?

If you utilize a flexible filing option (FR = Flexible Range, FT = Flexible Timing, or FX = Flexible Range and Flexible Timing) indicator in the initial transmission, then you must send an ISF with the CT = Compliant Transaction indicator to finalize the transaction. Failure to do so could result in liquidated damages. Please consider whether you need to use the flexible filing option since you can always update an ISF with more current information, but to be timely it must be done so 24 hours prior to vessel departure. Failure to file accurate information on a timely basis could result in liquidated damages. 

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