A: The columns you can select in a PowerView are based on the classes or type projections that the sub views are based on. All properties and components are merged together and can be selected by the creator of PowerView.
If the PowerView should display a property (example: Escalated property on an Incident) or a component (example: The display name of the affected user of an Incident) that is not available in any other sub views, PowerView will warn the user.
Depending on what the user wants to display this may or may not be an issue. For example, a Service Request does not have the property Escalated and therefore no data will be displayed in the Escalated column for any Service Request.
If the missing property or component is not an issue the warning can safely be ignored. Otherwise another sub view has to be picked that is based on a class or type projection that contains the missing properties or components.
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