Prospective operation of drawback rate changes limits later corrigenda; recovery of erroneous drawback remains within revisionary scrutiny.

Recovery of erroneously paid drawback was treated as part of the same subject as the drawback payment itself, so the revisionary authority could examine whether recovery was warranted. The text states that this issue fell within jurisdiction and was decided against the assessee. A later corrigendum reducing the drawback rate was characterised as a substantive change, not a clerical correction, and therefore operated prospectively unless retrospectivity was expressly or necessarily implied. Because the export had occurred before the corrigendum was issued, the drawback rate in force on the export date applied, and this issue was decided in favour of the assessee.

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Issues: (i) Whether recovery of erroneously paid drawback fell within the revisionary authority's jurisdiction; (ii) Whether the corrigendum reducing the drawback rate operated retrospectively so as to govern exports made before its issue.

Issue (i): Whether recovery of erroneously paid drawback fell within the revisionary authority's jurisdiction.

Analysis: The drawback payment and its recovery were treated as two aspects of the same subject. Where the original authority had proceeded on the basis that drawback was paid in excess and the appellate authority had held that no recovery could be made, the dispute concerned the correctness of the drawback payment itself. The recovery mechanism under the drawback rules and the Customs Act was therefore held to be within the scope of revisionary examination.

Conclusion: The issue was decided against the assessee and in favour of Revenue.

Issue (ii): Whether the corrigendum reducing the drawback rate operated retrospectively so as to govern exports made before its issue.

Analysis: The rate in the original drawback schedule was altered by a later corrigendum. The change was held to be substantive and not a mere clerical correction. A subsequent amendment affecting export incentive rates was held to operate prospectively unless retrospectivity was expressly provided or necessarily implied. Since the export had taken place before the corrigendum was published, the drawback rate in force on the date of export governed the claim.

Conclusion: The issue was decided in favour of the assessee and against Revenue.

Final Conclusion: The revision was allowed after holding that the later corrigendum did not retrospectively displace the drawback rate applicable on the date of export, while the authority retained jurisdiction to examine erroneous payment and recovery of drawback.

Ratio Decidendi: A substantive amendment to a drawback notification or schedule operates prospectively unless retrospective effect is expressly provided or necessarily implied, and recovery proceedings concerning erroneous drawback fall within the same subject-matter as the payment itself.

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