53Furthermore, as regards the request for damages in respect of the material and non-material harm allegedly caused to the applicant by the delay in the application of the attachment order, the Tribunal notes that it is settled case-law that under Articles 90 and 91 of the Staff Regulations, the admissibility of an action, in particular for damages, is conditional on the preliminary administrative procedure set out in those articles having been properly followed (judgment of 27 June 1989 in Giordani v Commission, 200/87, EU:C:1989:259, paragraph 22, and order of 25 October 2012 in BY v EASA, F‑8/12, EU:F:2012:148, paragraph 37).
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