Member States may provide that the opening of insolvency proceedings against a participant or a system operator of an interoperable system shall not prevent funds or securities available on the settlement account of that participant from being used to fulfil that participant4s obligations in the system or in an interoperable system on the business day of the opening of the insolvency proceedings. Member States may also provide that such a participant's credit facility connected to the system be used against available, existing collateral security to fulfil that participant's obligations in the system or in an interoperable system.