How to obtain IWorkItemCommon

I need to obtain an IWorkItemCommon. I searched the RTC SDK source and found a number of methods that use IAuditableCommon#getPeer(CLASS<T>) to get an IWorkItemCommon. I followed this same approach in my code:

public void run( AdvisableOperation operation,

         IProcessConfigurationElement advisorConfiguration,

         IAdvisorInfoCollector collector, IProgressMonitor monitor )

         throws TeamRepositoryException

   {

      Object data = operation.getOperationData();

      if (data instanceof ISaveParameter)

      {

         ISaveParameter saveParameter = (ISaveParameter)data;

         IWorkItemCommon workItemCommon =

            saveParameter.getSaveOperationParameter().

            getAuditableCommon().getPeer(IWorkItemCommon.class);

         ...

      }

   }

The code runs fine. However, IAuditableCommon#getPeer(Class<T>) is marked as deprecated. So what's the proper way to obtain an IWorkItemCommon in this context?

Thanks,
Geoff Alexander