By way of derogation from Article 270, an originator institution may calculate the risk-weighted exposure amounts of a senior securitisation position in accordance with Article 260, 262 or 264 where both the following conditions are met:
(a) the securitisation was issued before 9 April 2021;
(b) the securitisation met, on 8 April 2021, the conditions laid down in Article 270 as applicable at that date.