WTO Dispute Settlement Mechanism(6)

agreements] before the burden of showing consistency with that provision is taken on by the defending party, is not avoided by simply describing that same provision as an ‘exception’. In much the same way, merely characterizing a treaty provision as an ‘exception’ does not by itself justify a ‘stricter’ or ‘narrower’ interpretation of that provision than would be warranted by examination of the ordinary meaning of the actual treaty words, viewed in context and in the light of the treaty's object and purpose, or, in other words, by applying the normal rules of treaty interpretation. It is also well to remember that a prima facie case is one which, in the absence of effective refutation by the defending party, requires a panel, as a matter of law, to rule in favour of the complaining party presenting the prima facie case.” 10
In short, during the process of the establishment of a violation, it’s generally up to the complainant to provide evidence concerning inconsistency, and only in case of limited exceptions the burden of proof rests upon the defending party invoking a defence in the nature of affirmative defences, such as those found in Art. XX or Art. XI:2(c)(i) of the GATT 1994.
(iii) Special Rules Concerning Non-Violation Claims
As suggested by the corresponding provisions, the most significant difference between violation complaints under Art. XXIII:1(a) of the GATT 1994 and non-violation ones under Art. XXIII:1(b) is, while, when violation complaints are brought under Art. XXIII:1(a), the infringement of an obligation of the agreements is considered pr

ima facie to constitute a case of nullification or impairment, from the fact of violation alone, by establishing a formal presumption, such a presumption does not exist in non-violation cases.
With the lack of such a presumption, and given the nature of the factually complex disputes and particular claims of non-violation nullification or impairment, the resolution of issues relating to the proper allocation of the burden of proof is of particular importance. In case of non-violation nullification or impairment, i.e., where the application of Art. XXIII:1(b) is concerned, Art. 26.1(a) of the DSU and panel practice in the context of the WTO Agreement and GATT jurisprudence confirm that this is an exceptional course of action for which the complaining party bears the burden of providing a detailed justification to back up its allegations.
This requirement has been recognized and applied by a number of GATT panels. For example, the panel on Uruguayan Recourse to Art. XXIII noted that in cases “where there is no infringement of GATT provisions, it would be ... incumbent on the country invoking Article XXIII to demonstrate the grounds and reasons for its invocation. Detailed submissions on the part of that contracting party on these points were therefore essential for a judgement to be made under this Article”. And the panel on US - Agricultural Waiver noted, in applying the 1979 codification of this rule: “The party bringing a complaint under [Article XXIII:1(b)] would normally be expected to explain in detail that benefits accruing to it under a tariff concession have been nullified or impaired”.
Art. 26.1(a) of the DSU codifies the prior GATT practice, which provides in relevant part: “the complaining party shall present a detailed justification in support of any complaint relating to a measure which does not conflict with th

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