The submitted notes on including Reading Type suggest non-power, non-energy readings be exchanged: Quality. Energy Interoepration does not currentyl support Quality feedback as part of Energy Interoperationn.
There should be a signal type to transmist quality readings Quality is an Emix Type, it can appear per Interval, so mechanically its OK. Quality has a number of measures that are different than the tope level service request. THis can consist of sending an "empty" quality warrant down with a reporting expectation. THe Feedback is then a completed Q Warrant, with the appropriate Intervals. per request, to segment the response.
Does this mean we need to have a service to enable a buyer (or VEN) to say "wait a mniute, you've been giving me lousy power!" and return a Quantity feedback w/o request?