1. A method carried out by a policy decision function in a telecommunication network, the method comprising a providing procedure for providing, to at least one of a policy enforcement function and a traffic detection function, an instruction; identifying at least one service instance of a service, the at least one service instance of the service being identified in the instruction by the order according to which the at least one service instance of the service one of has been, have been and may be started; and indicating at least one of: (i) a service instance level reporting rule according to which the at least one of a policy enforcement function and a traffic detection function should one of report and not report information to the policy decision function after occurrence of an event relating to any one of the identified at least one service instance; and (ii) a service instance level enforcement rule that the at least one of a policy enforcement function and a traffic detection function should enforce on a received packet relating to any one of the identified at least one service instance.