A method of reporting a resource allocation result when successive resource request and resource modifications occur before being aware of an allocation result for a previous resource, the method carried out at a policy control server and comprising: receiving (S-710, S-310, S-340), from an application function, AF, node , an AF session establishment request (S-300) and one or more AF session modification requests (S-310, S-340), wherein each request, among the AF session establishment request and the one or more AF session modification requests, comprises a media component description and a media component instance identifier for the media component description; for each of the requests, among the AF session establishment request and the one or more AF session modification requests: determining, for the media component description, a control rule and a rule instance identifier for the control rule, wherein the control rule includes a control rule name, associating (S-720) the media component instance identifier with the rule instance identifier, and transmitting (S-730, S-320, S-350), to a policy enforcement node , the control rule and the rule instance identifier; receiving (S-740, S-365), from the policy enforcement node, a report, wherein the report indicates a resource allocation result, a control rule name for an affected control rule and a rule instance identifier; determining (S-750) a media component instance identifier associated with the received rule instance identifier for the affected control rule; and transmitting (S-760, S-375), to the AF node, a report, wherein the report indicates the resource allocation result and the determined media component instance identifier. receiving (S-710, S-310, S-340), from an application function, AF, node , an AF session establishment request (S-300) and one or more AF session modification requests (S-310, S-340), wherein each request, among the AF session establishment request and the one or more AF session modification requests, comprises a media component description and a media component instance identifier for the media component description; for each of the requests, among the AF session establishment request and the one or more AF session modification requests: determining, for the media component description, a control rule and a rule instance identifier for the control rule, wherein the control rule includes a control rule name, associating (S-720) the media component instance identifier with the rule instance identifier, and transmitting (S-730, S-320, S-350), to a policy enforcement node , the control rule and the rule instance identifier; determining, for the media component description, a control rule and a rule instance identifier for the control rule, wherein the control rule includes a control rule name, associating (S-720) the media component instance identifier with the rule instance identifier, and transmitting (S-730, S-320, S-350), to a policy enforcement node , the control rule and the rule instance identifier; receiving (S-740, S-365), from the policy enforcement node, a report, wherein the report indicates a resource allocation result, a control rule name for an affected control rule and a rule instance identifier; determining (S-750) a media component instance identifier associated with the received rule instance identifier for the affected control rule; and transmitting (S-760, S-375), to the AF node, a report, wherein the report indicates the resource allocation result and the determined media component instance identifier. <EOS>