Tap issues

Article 484 and 486 of Regulation (EU) No. 575/2013 (CRR) provide for the grandfathering treatment of Tier 2 instruments that do not meet the criteria of Articles 62 and 63. Article 63 provides that callable Tier 2 should have a first call date not before five years after the date of issuance or raising (except Article 78(4)). When an institution has issued before 31/12/2011 a callable (non step) Lower Tier 2 bond with a first call date at year 5 and then has made a tap on that issue (i.e. increased the amount of the original issue a year later, for example), what is the grandfathering treatment of the amounts raised through the tap? Is it the same as the original bond (i.e. fully eligible) or should the tap be considered non fully eligible Tier 2 because, as of the tap date, the first call was before year 5, in which case the tap should be included in the amortized stock according to Article 86.

See question.