Approved classification lists can be corrected for differential duty, and writ relief is usually unavailable against a show-cause notice.

A proper officer may correct an approved classification list and issue notice for differential duty under excise law where the earlier classification is found erroneous, because Section 11A authorises recovery of short-levied or non-levied duty and Rule 173B permits modification by the same authority. The assessee is entitled to notice and an opportunity to respond, but prior approval of the classification list does not create an estoppel against law. The writ petition was declined because tariff classification and duty demand are matters for the statutory adjudicatory process, and extraordinary writ jurisdiction is ordinarily not invoked when an effective alternative remedy exists.

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Issues: (i) Whether the proper officer had jurisdiction under Rule 173B(5) read with Section 11A to modify an approved classification list and issue notice for differential duty. (ii) Whether the writ petition should be entertained despite the availability of statutory remedies under the excise law.

Issue (i): Whether the proper officer had jurisdiction under Rule 173B(5) read with Section 11A to modify an approved classification list and issue notice for differential duty.

Analysis: Section 11A authorises recovery proceedings where duty has not been levied, short-levied, short-paid, or erroneously refunded, and the power is not confined by any implied restriction merely because a classification list had earlier been approved. Rule 173B contemplates approval of the classification list by the proper officer and, where the rate of duty or other relevant factors require it, modification by the same statutory authority. The Court held that the power to modify the rate of duty necessarily includes power to correct the classification list when the approved classification is found to be erroneous. There is no estoppel against law, and if adverse consequences follow, the assessee must be given notice and opportunity of representation in conformity with natural justice.

Conclusion: The notice was not without jurisdiction and the proper officer was competent to proceed under Rule 173B(5) read with Section 11A.

Issue (ii): Whether the writ petition should be entertained despite the availability of statutory remedies under the excise law.

Analysis: The dispute related to tariff classification and proposed demand of duty, matters for which the statute provides a complete adjudicatory mechanism including reply, adjudication, appeal, and revision. The Court declined to pronounce on the merits of the classification at the stage of a show-cause notice and reiterated that extraordinary writ jurisdiction is ordinarily not to be invoked when an effective alternative remedy exists.

Conclusion: The writ petition was not maintainable at this stage and the petitioner was relegated to the statutory remedy.

Final Conclusion: The challenge to the show-cause notice failed, and the dispute was left to be decided under the statutory excise framework.

Ratio Decidendi: A proper officer may correct an approved classification list and issue notice for differential duty under the excise law where the classification is found erroneous, and writ jurisdiction will ordinarily not be exercised against such a notice when an effective statutory remedy is available.

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