59However, the existence of substantial new facts may justify the submission of a request for reconsideration of a previous decision which has become definitive. If a measure constitutes the reply to a request in which substantial new facts are relied on, and whereby the administration is requested to reconsider its previous decision, that measure cannot be regarded as merely confirmatory in nature, since it constitutes a decision taken on the basis of the supposed substantial new facts and thus contains a new factor as compared with the previous decision. Thus, after reconsideration, based on substantial new facts, of a decision which has become definitive, the institution concerned must take a new decision, the legality of which may where necessary be challenged before the EU judicature. However, in the absence of substantial new facts, the institution is not required to reconsider its earlier decision (judgments of 7 February 2001, Inpesca v Commission, T‑186/98, EU:T:2001:42, paragraphs 46 to 48, and of 13 November 2014, Spain v Commission, T‑481/11, EU:T:2014:945, paragraphs 34 and 35).