(6)With regard to cooperative institutions, a common feature is in general the ability of members to resign and therefore to require the redemption of the Common Equity Tier 1 capital instruments they hold. That does not prevent a cooperative society from issuing qualifying Common Equity Tier 1 capital instruments for which there is no possibility for the holders to put the instruments back to the institution, provided that these instruments meet the provisions of Article 29 of Regulation (EU) No 575/2013. Where an institution issues different types of instruments under Article 29 of that Regulation, there should be no privileges assigned to only some of these types of instruments other than the ones foreseen in Article 29(4) of that Regulation.