Which Statement is NOT correct regarding demand schedules when planning supply?

A demand schedule can be another Demand Plan, a Sales & Operations Plan, or a Production Plan.

A demand schedule's "End Item Demand" measure must be one of: Final Shipments Forecast, Final Bookings Forecast. Approved Final Shipments Forecast, or Approved Final Bookings Forecast.

An integrated demand and supply plan can have more than one demand schedule.

External forecast loaded from flat files can be a demand schedule.