99As is clear from the Court’s settled case-law, a breach of the principle of equal treatment, applicable to the law relating to the employment of Community officials, occurs when two categories of person whose factual and legal circumstances disclose no essential difference are treated differently at the time of their recruitment and that difference in treatment is not objectively justified (see Case C-459/98 P Martínez del Peral Cagigal v Commission [2001] ECR I-135, paragraph 50 and Centeno Mediavilla and Others v Commission, paragraph 76).
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