(3)In order to allow the depositary to assess and monitor custody and insolvency risk, the written contract should provide sufficient detail on the categories of financial instruments in which the UCITS may invest and cover the geographical regions in which the UCITS plans to invest. The contract should also contain details of an escalation procedure in order to specify the circumstances, notification obligations and the steps to be taken by a depositary's staff member, at any level of its organisational structure, in relation to any detected discrepancies, including notification to the management company or the investment company or/and competent authorities, as required by this Regulation. Therefore, the depositary should alert the management company or the investment company of any material risk identified in a particular market's settlement system. The termination of the contract should reflect the fact that it represents the depositary's last resort when not satisfied that assets are sufficiently protected. It should also prevent moral hazard whereby the UCITS would make investment decisions irrespective of custody risks on the basis that the depositary would be liable. In order to maintain a high standard of investor protection, the requirement laying down the details for the monitoring of third parties should be applied in relation to the whole custody chain.