All of the Servicesin these four Service Setsonly provide the Clientwith information, with the exception of the TransferSubscriptions Servicein the Subscription Service Set. In general, these services will not generate audit entries or audit Event Messages. The TransferSubscriptions Serviceshall generate an audit Eventof type AuditSessionEventTypeor subtypes of it for both successful and failed Serviceinvocations. See OPC 10000-5for the detailed assignment of the SourceNode, the SourceNameand additional parameters. For the failure case, the Messagefor Events of this type should include a description of why the service failed.

For Clientsthat support auditing, accessing the TransferSubscriptions Servicein the Subscription Service Setshall generate audit entries for both successful and failed invocations of the Service. Invocations of the other Servicesin this Service Setdo not require audit entries. All audit entries should be setup prior to the actual Serviceinvocation, allowing the invocation to contain the correct audit record id.