109It must be borne in mind, however, that the institutions are under a duty to exercise their powers in accordance with the general principles of EU law, such as the principle of equal treatment and the principle of sound administration, and that, regard being had to those principles, they must take into account the decisions already taken in respect of similar applications and consider with especial care whether they should decide in the same way or not. That said, the way in which the principles of equal treatment and sound administration are applied must be consistent with respect for legality (see, by analogy, Case C-51/10 PAgencja Wydawnicza Technopol v OHIM [2011] ECR I-1541, paragraphs 73 to 75 and the case-law cited).