(61)IORPs should be allowed to entrust any activity, including key functions, in whole or in part, to service providers operating on their behalf. IORPs should remain fully responsible for discharging all of their obligations under this Directive when they outsource key functions or any other activities. IORPs should enter into a written agreement with the service provider when outsourcing any activity. For the purposes of this Directive, this does not include agreements for operational type services for example, for security or maintenance personnel.