1. A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, the computer readable program code adapted to be executed to implement a method, the method comprising: storing policy data for a plurality of entities; handling a message in a network with reference to first policy data corresponding to a first one of the entities to which the message relates; combining the first policy data with second policy data corresponding to a second one of the entities to which the message relates thereby resulting in combined policy data; and handling the message in the network with reference to the combined policy data.