68Thus, the broad discretion enjoyed by the EU institutions with regard to the organisation of their departments, like EPSO under the conditions referred to in paragraph 67 above, is governed in mandatory terms by Article 1d of the Staff Regulations, so that differences of treatment based on language resulting from restrictions on the language regime of a competition to a limited number of official languages can only be accepted if such a restriction is objectively justified and proportionate to the real needs of the service. In addition, any requirement relating to specific language skills must be based on clear, objective and foreseeable criteria enabling candidates to understand the reasons for that requirement and allowing the EU judicature to review the lawfulness thereof (see, to that effect, judgment of 26 March 2019, Commission v Italy, C‑621/16 P, EU:C:2019:251, paragraphs 90 to 93 and the case-law cited).
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