(36)Given the difficulties in segregating cash, the current practices for the exchange of cash collateral in certain jurisdictions and the need for reliance on cash instead of securities in certain circumstances where transferring securities may be impeded by operational constraints, cash collateral collected as initial margin should always be held by a central bank or third-party credit institution, since this ensures the separation from the two counterparties to the contract. To ensure such separation, the third-party credit institution should not belong to the same group as either of the counterparties.