(2)Pursuant to Article 4(1)(e) of Regulation (EU) No 1024/2013, the ECB, as the competent authority for significant supervised entities, is responsible for granting prior permission to significant supervised entities for extension of the deadline for implementing sequentially the Internal Ratings Based Approach to calculate their own funds requirements for credit risk across different classes of exposures and business units pursuant to Article 148 of Regulation (EU) No 575/2013, to revert to the use of less sophisticated approaches pursuant to Article 149 of Regulation (EU) No 575/2013 and to permanently use the Standardised Approach pursuant to Article 150 of Regulation (EU) No 575/2013.