(19)Central banks of issue should be involved in the preparation of decisions by the CCP Supervisory Committee in relation to the classification of third-country CCPs according to their systemic importance and the supervision of Tier 2 CCPs in order to ensure the proper exercise of their tasks related to the monetary policy and the smooth operation of payment systems. As decisions by ESMA in relation to Tier 2 CCPs on margin requirements, liquidity risk control, collateral, settlement and approval of interoperability arrangements could be of particular relevance for central banks' tasks, the CCP Supervisory Committee should consult central banks of issue of all Union currencies of the financial instruments cleared or to be cleared by third-country CCPs on the basis of a ‘comply or explain’ mechanism.