26According to the case-law, Article 91(2) of the Staff Regulations establishes a rule of correspondence between the complaint, within the meaning of that provision, and the ensuing application. Under that rule, a plea raised before the Courts of the European Union must, if it is not to be declared inadmissible, have already been raised in the context of the pre-litigation procedure, in order that the appointing authority be in a position to know the criticisms which the official concerned makes against the contested decision. The correspondence rule is justified by the very purpose of the pre-litigation procedure, which is designed to enable an amicable settlement of the differences that have arisen between the officials and the administration (Commission v Moschonaki, paragraphs 71 and 72 and the case-law cited).
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