Hi @Balkis Zaitoun 
Order start date and end date is day when the order was ordered and and end date is just a normal end date when the order has to stop charging

Order executed is when the item is administered or given to patient.

Order status varies on Mutiple options: verified is default when ordered and executed is when its given to patient and discontinued is like deleting from charging against the patient

Its a representation of order priority, eg:, stat, discharge medication etc

Hope this helps