Extra coaches when planned earlier and announced is fine.. With the existing rake it shudnt be the case. The predictors have no idea of auto upgradation happening similar to how HO is being used by the pax. So to my thoughts it should be VOID. Automatically or Manual predictors cant keep Autoupgradation in mind when predicting. Tell me how will a Person think this will be autoupgraded and mark Conf to it. Manual or Automatic something unexpected at the time of prediction should be marked VOID is my point. Historical rules can be discussed over and if required should be changed.