Sufficient cause for delayed supplementary Bills of Entry requires a reasoned waiver assessment, not automatic system-generated late charges.
Late-presentation charges under Section 46(3) require the proper officer to be satisfied that no sufficient cause existed for delayed filing. Regulation 4(3) prescribes the late-charge framework and permits waiver where the reasons for delay are satisfactory. A delayed supplementary Bill of Entry for excess cargo is not automatically liable or automatically exempt; the assessment depends on timely original filing, linkage of the excess cargo to the same consignment, prompt amendment efforts, absence of importer fault, bona fides and duty compliance. Electronic calculation cannot substitute for a reasoned determination on sufficient cause.