EBU Single Rulebook Q&A 3 July 2013 2013_21 Deferral of Tier 2 coupons

Can Tier 2 instruments include terms according to which coupons would be mandatorily deferred or cancelled if coupons were not paid on Additional Tier 1 instruments? Some existing Tier 2 instruments include such terms. Institutions may therefore raise the issue of consistent treatment.