93Moreover, as regards the argument that the General Court, in particular in paragraph 113 of the judgment under appeal, incorrectly required ‘concrete indications’ so as to supplement the statement of reasons for the notices of competition at issue in respect of the restriction of the choice of language 2 of the competition, it should be pointed out that it is for the institution which instituted a difference in treatment based on language to establish that that difference is well suited to meet the actual needs relating to the duties which the persons recruited will be required to carry out. In addition, any requirement relating to specific language skills must be proportionate to that interest and be based on clear, objective and predictable criteria enabling candidates to understand the reasons for that requirement and allowing the EU judicature to review the lawfulness thereof (see judgment of today’s date, Spain v Parliament, C‑377/16, paragraph 69).
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