Res judicata barred reopening of customs valuation after the earlier final order had settled the transaction value.

An earlier customs valuation order accepting the declared transaction value had attained finality, and the Department's appeal against it was dismissed as withdrawn. Applying res judicata, the tribunal held that the same valuation issue could not be reopened in a later proceeding merely on the basis of subsequent investigation, because the earlier determination had not been lawfully displaced. The reopening was therefore impermissible and the impugned order was set aside.

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Issues: Whether the valuation of the imported goods could be reopened in a second proceeding after the earlier order accepting the declared transaction value had attained finality and the Department's appeal against that order had been dismissed as withdrawn.

Analysis: The earlier appellate order in favour of the importer had settled the valuation dispute. The Department's appeal against that order was dismissed after withdrawal, and the order rejecting the Department's attempt to introduce additional grounds was not challenged. In these circumstances, the same valuation issue could not be reopened in subsequent proceedings on the basis of later investigation, as finality had attached to the earlier determination. The doctrine of res judicata was applied to prevent repeated litigation on the same issue and to preserve certainty in adjudication.

Conclusion: The reopening of valuation was impermissible, and the impugned order was set aside; the appeals succeeded.

Ratio Decidendi: Once an issue directly and substantially decided in earlier customs proceedings has attained finality and the departmental challenge to that decision has been withdrawn or dismissed, the same issue cannot be reopened in later proceedings merely because of subsequent investigation, unless the earlier finality is lawfully displaced.

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