Mandatory duplicate invoice proof governs Modvat credit; original or xerox copies cannot substitute absent compliance with prescribed procedure.

Modvat credit on an original invoice was permissible only where the duplicate invoice had been lost in transit and the assessee satisfied the proper officer about that loss; use of extra or xerox copies was not accepted under the rules. The Tribunal treated this documentary requirement as mandatory, not a curable technicality, because it was designed to prevent misuse and fraud. Failure to inform the Assistant Commissioner and to comply with the prescribed procedure rendered the credit claim inadmissible, and the earlier appellate relief was set aside.

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Issues: (i) Whether Modvat credit could be taken on the strength of original or extra/xerox copies of invoices when the duplicate invoice was allegedly lost in transit and prior permission was not obtained from the Assistant Commissioner. (ii) Whether such defects were merely procedural and technical so as to permit credit despite non-compliance with the prescribed documentary requirements.

Issue (i): Whether Modvat credit could be taken on the strength of original or extra/xerox copies of invoices when the duplicate invoice was allegedly lost in transit and prior permission was not obtained from the Assistant Commissioner.

Analysis: The governing scheme required credit to be taken on the duplicate invoice, and Rule 57G(2A) permitted use of the original invoice only where the duplicate had been lost in transit and the manufacturer satisfied the Assistant Commissioner about that loss. The Tribunal treated this as a mandatory requirement. The assessees had not informed the Assistant Commissioner of the loss of the duplicate invoice and had also relied on extra or xerox copies not prescribed under the rules.

Conclusion: The credit was not admissible on the original or extra/xerox copies in the absence of compliance with the mandatory requirement.

Issue (ii): Whether such defects were merely procedural and technical so as to permit credit despite non-compliance with the prescribed documentary requirements.

Analysis: The earlier appellate order had treated the defects as technical and extendable by way of substantive benefit. The Tribunal rejected that approach by following the Larger Bench rulings, holding that a distinction must be drawn between condonable procedural irregularities and non-condonable substantive requirements intended to prevent misuse and fraud. The assessee's failure to establish loss of the duplicate invoice and to satisfy the Assistant Commissioner could not be treated as a curable technical lapse.

Conclusion: The defects were substantive, not merely procedural, and the assessee was not entitled to Modvat credit on that basis.

Final Conclusion: The assessee's credit claims failed, the appellate relief granted earlier was set aside, and the Revenue's challenge succeeded.

Ratio Decidendi: Where the rules make duplicate invoice evidence mandatory, credit on the original invoice is permissible only after the assessee establishes loss of the duplicate in transit and satisfies the proper officer; non-compliance is a substantive defect and not a mere technical irregularity.

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