11The background to the dispute was set out in paragraphs 1 to 26 of the judgment under appeal in the following terms:1. The applicant, DI, joined the [ECB] as a member of staff in 1999. He performed the duties of senior IT assistant, classified in salary band D, when he became the subject of disciplinary proceedings concerning claims for reimbursement of, first, physiotherapy invoices, second, receipts for pharmacy expenses and, third, learning support invoices.2. By several notes dated from 13 December 2013 to 23 November 2015, the company managing the ECB’s health insurance scheme (“Company A”) informed it of two sets of facts. First, the applicant allegedly unlawfully submitted to it physiotherapy invoices for reimbursement, even though those invoices had been provided by B, a beautician, and, second, he allegedly claimed reimbursement of fake receipts for pharmacy expenses.3. On 14 May 2014, the ECB reported to the Staatsanwaltschaft Frankfurt am Main (Public Prosecutor’s Office, Frankfurt am Main, Germany, “the Public Prosecutor’s Office”) the facts concerning the reimbursement of the physiotherapy invoices.4. By decision of 21 October 2014, the ECB’s Executive Board decided to suspend the applicant from his functions and to deduct 30% of his basic salary for a maximum period of four months as from November 2014. That decision was based on the information provided by Company A and by the need to safeguard the criminal investigation and the disciplinary follow-up.5. On 23 January 2015, the ECB sent the Public Prosecutor’s Office the additional information which Company A had provided to it concerning the claims for reimbursement of the pharmacy receipts.6. After hearing the applicant on 3 February 2016, the Directorate-General (DG) for “Human Resources, Budget and Organisation” of the ECB drew up, on 8 September 2016, a “report on a possible breach of professional duties” …, pursuant to Article 8.3.2 of the ECB Staff Rules … That report found two sets of facts against the applicant. In the first place, from 12 November 2009 to 29 September 2014, the applicant submitted to Company A 86 invoices relating to physiotherapy sessions provided by B to his wife, their children, and himself in the amount of EUR 61490, for which he obtained reimbursement in the amount of EUR 56 041.09, although B is not a physiotherapist but a beautician. In the second place, between February 2009 and September 2013, the applicant also submitted fraudulently to Company A handwritten pharmacy receipts for a total amount of EUR 21 289.08, of which Company A reimbursed EUR 19 427.86.7. On 12 September 2016, the Public Prosecutor’s Office issued an indictment formally charging the applicant and referring him to the criminal court for fraud within the meaning of Article 263(1) of the Strafgesetzbuch (German Criminal Code) and forgery of documents pursuant to Article 267 of that code for having improperly claimed reimbursement of 71 invoices for physiotherapy treatment. In the same indictment, the Public Prosecutor’s Office, acting in accordance with Article 154 of the Strafprozessordnung (German Criminal Procedure Code), closed the part of the case relating to the pharmacy receipts without taking any further action, since the facts complained of still required substantial measures of inquiry.8. On 18 November 2016, the ECB’s Chief Services Officer “acting on behalf of the Executive Board” initiated disciplinary proceedings against the applicant for an alleged breach of his professional duties requiring the involvement of the Disciplinary Committee and requested the latter to deliver an opinion in accordance with Article 8.3.15 of the Staff Rules. Initiated in the light of [the “report on a possible breach of professional duties” of 8 September 2016], those proceedings concerned the facts relating to the physiotherapy invoices and the pharmacy receipts.9. The Disciplinary Committee exchanged several letters with the applicant and interviewed him on 13 February 2017.10. On 5 September 2017, DG “Human Resources, Budget and Organisation” of the ECB drew up a second “report on a possible breach of professional duties” within the meaning of Article 8.3.2 of the Staff Rules … That report concerned learning support invoices for the applicant’s two children, for which he had claimed reimbursement under Article 3.8.4 of the Staff Rules in 2010, 2012 and 2014 and again in January 2017. According to that report, there was a reasonable suspicion that the invoices issued by Tutor C for learning support were not genuine and authentic.11. In the light of [that second report], the Chief Services Officer, “acting on behalf of the Executive Board”, decided on 19 September 2017 to extend the mandate of the Disciplinary Committee to those facts.12. On 12 October 2017, the ECB filed a complaint with the Public Prosecutor’s Office concerning the part of the case relating to the learning support invoices.13. The Disciplinary Committee interviewed the applicant and his wife on 17 October 2017.14. On 18 October 2017, a criminal chamber of the Landgericht Frankfurt am Main (Regional Court, Frankfurt am Main, Germany) acquitted the applicant of the charges relating to the physiotherapy invoices for “reasons of facts”, the court having concluded, “following the main proceedings, it was not established … that there was a basis for the accusations”.15. On 11 April 2018, the Disciplinary Committee delivered its opinion. First of all, it considered that the inauthenticity of the physiotherapy invoices had not been sufficiently established, but that the applicant knew that B was a beautician, not a physiotherapist, or that he should at the very least have questioned her qualifications. Next, the Disciplinary Committee considered that the facts giving rise to the complaints concerning the submission of the pharmacy receipts and learning support invoices were also not sufficiently established and that it was appropriate to close the proceedings in that regard, subject to re-opening them if new evidence were to be produced. In the light of the foregoing, the Disciplinary Committee recommended that a penalty be imposed on the applicant consisting of a temporary salary reduction of EUR 400 per month over a period of 12 months.16. After the applicant had submitted his observations on the Disciplinary Committee’s opinion of 11 April 2018, the Chief Services Officer notified to him a decision of 10 July 2018 by which the Executive Board decided to exercise itself the disciplinary power in this case (“the decision of 10 July 2018”).17. The Chief Services Officer subsequently notified to the applicant a draft decision of the Executive Board seeking to dismiss him without notice. An exchange of correspondence followed.18. On 7 May 2019, the Executive Board decided to dismiss the applicant without notice (“the dismissal decision”).19. First, the Executive Board found that (i) “for almost five years, [the applicant] showed complete and persistent disinterest whether [B] had the required qualifications for providing the physiotherapy services, despite their existing clear and manifest objective reasons for inquiring about her qualifications”, and (ii) he had “actively concealed part of the information” from Company A and from the ECB.20. Second, as regards the pharmacy receipts, of which there were more than 500, the Executive Board took the view that the applicant could not have been unaware that it was very unusual in Germany for them to be handwritten and that there were objective indicia proving that they were not genuine and authentic.21. Third, as regards the learning support invoices, the Executive Board found, inter alia, that the tax number on those invoices was almost identical to that mentioned on the physiotherapy invoices and that the Frankfurt am Main tax authorities (Germany) had confirmed that it was not genuine. The Executive Board also observed that C’s address on those invoices was also virtually identical to that of B. The ECB therefore considered that it was highly unlikely that the applicant had not noted those similarities. Consequently, the Executive Board found that the applicant had submitted learning support invoices for reimbursement which were not genuine and authentic.22. In the light of all the foregoing, the Executive Board stated, in essence, that the right to claim reimbursement for medical expenses and learning support did not mean that members of staff may disregard circumstances vitiating the issue of invoices or receipts which were such that any reasonable person exercising ordinary care would have raised questions as to whether those invoices or receipts constituted appropriate documentation entitling them to reimbursement. In the presence of such circumstances, the Executive Board took the view that it was for members of staff at least to inform the administration thereof of their own volition and to cooperate with the administration. The Executive Board therefore concluded that the applicant was guilty, first, of having breached his duty of loyalty to the institution, second, of having failed to respect the ECB’s common values and to conduct himself in his professional and private life in accordance with the ECB’s statute, third, of having continuously breached his duty to preserve the institution’s financial interests and, fourth, of having put at risk the Bank’s reputation.23. In the meantime, on 30 April 2019, the Public Prosecutor’s Office informed the applicant that the investigation relating to the learning support invoices had been closed pursuant to Article 170(2) of the Code of Criminal Procedure, on the ground that there were not sufficient suspicions to bring a public prosecution.24. By letter of the same day, registered by the ECB on the following 15 May, the Public Prosecutor’s Office also informed the ECB that that investigation had been closed. In that letter, the Public Prosecutor’s Office added that searches had revealed that there was no official registration of C and that the tax number on her invoices had not been allocated. However, the Public Prosecutor’s Office considered that it could not be ruled out that the invoices in question were indeed issued and paid by the accused and that the false information contained therein could be explained by “other reasons”.25. By letter of 12 June 2019, the applicant informed the Chief Services Officer of the outcome of the proceedings brought by the Public Prosecutor’s Office concerning the learning support invoices and requested that the ECB reconsider its dismissal decision.26. By letter of 26 June 2019, the Chief Services Officer informed the applicant of the decision of the Executive Board of previous 25 June refusing to reopen the disciplinary proceedings … That decision is based on two grounds. The ECB contended, first of all, that the Public Prosecutor’s Office had to ascertain whether the alleged facts constituted an infringement of German criminal law in the light of the evidential criteria applicable to criminal proceedings, whereas it had to examine whether the facts alleged constituted an infringement of its own employment rules in the light of different evidential criteria applicable to disciplinary proceedings. Next, it stated that the Public Prosecutor’s Office had confirmed that there was no official registration of C and that the tax number on the invoices was not genuine.’