Rectification powers cannot reopen a valid eligibility certificate on debatable exemption issues or later write-off events.

Section 4-A(3) rectification power was limited to correcting clerical or arithmetical mistakes and could not be used to reopen a conscious decision of the Divisional Level Committee on a debatable issue of law or fact. The Commissioner therefore could not withdraw or amend an eligibility certificate on the basis that exemption relating to dyes and moulds used through job workers, or machinery later written off, had been wrongly granted. As no patent error or misuse of the certificate was shown, and subsequent events could not create a rectifiable defect in an earlier valid grant, interference under Section 4-A(3) was not justified and the exemption challenge failed.

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Issues: Whether the Commissioner could invoke rectification powers under Section 4-A(3) to withdraw or amend the eligibility certificate on the ground that exemption on dyes and moulds used through job workers and on machinery later written off was wrongly granted.

Analysis: The power under Section 4-A(3) was confined to correcting clerical or arithmetical errors and could not be used as an appellate substitute to revisit a conscious decision of the Divisional Level Committee on a debatable question of law or fact. The claim relating to dyes and moulds used through job workers, and the contention regarding subsequent write-off of machinery, did not disclose any misuse of the eligibility certificate or any patent mistake apparent from the record. The controversy was at best debatable, and subsequent events could not create a rectifiable error in a certificate validly granted earlier.

Conclusion: The Commissioner had no jurisdiction to interfere under Section 4-A(3), and the challenge to the exemption failed. The question was answered against the revenue and in favour of the assessee.

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