Whereas the principle of legal certainty precludes any necessity for the institution which adopted the decisions to re-examine, at the request of other addressees, in the light of the grounds of the annulling judgment, the legality of the unchallenged decisions, the Ombudsman is not convinced that the same logic ought to apply in the case of two decisions being addressed to one and the same person. The Ombudsman, therefore, finds it difficult to see how the principle of legality could be infringed by setting aside a decision addressed to a given person that is based on the very same approach, which was declared invalid as regards another decision, addressed to the same person.