Grandfathering of own funds instruments

May capital instruments be adjusted stepwise with the unadjusted part still being eligible for grandfathering? Take the following example: - An institution has issued a hybrid Tier 1 instrument that does not meet the requirements of Article 52 but is eligible for grandfathering; - starting in 2013, the bank adjusts in each year the terms and conditions of 10% of the nominal amount in order to make it fully eligible as Additional Tier 1 (AT1) under Regulation (EU) No 575/2013; - the terms and conditions of the remaining nominal amount of the capital instrument are kept unchanged. May the institution recognize the remaining part of the capital instrument as AT 1 under the grandfathering rules of the Regulation (EU) No 575/2013 given that only the nominal amount but not the terms and conditions of this remaining part are adjusted or does the change of the nominal amount also constitute a change of the whole contract, making the whole instrument no longer eligible for grandfathering since the new contract is concluded after the cut-off date mentioned in Article 484 (1)?

Not given