132In the latter scenario, the defendant institution may, including once litigation is under way, provide additional clarification rendering nugatory a plea alleging a failure to state reasons (see, to that effect, judgments of 30 May 1984, Picciolo v Parliament, 111/83, EU:C:1984:200, paragraph 22; of 8 March 1988, Sergio and Others v Commission, 64/86, 71/86 to 73/86 and 78/86, EU:C:1988:119, paragraph 52; and of 30 November 1993, Perakis v Parliament, T‑78/92, EU:T:1993:107, paragraph 52). If it does so, however, the defendant institution may not substitute a completely new set of reasons for the initial, incorrect reasons set out in the act being challenged (see, to that effect, judgments of 7 February 1990, Culin v Commission, C‑343/87, EU:C:1990:49, paragraph 15, and of 6 November 1997, Berlingieri Vinzek v Commission, T‑71/96, EU:T:1997:170, paragraph 79).