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You can set a minimum price for a specific room directly in the details of the room, from the section Rooms/Apartments - Show - Edit - scroll down and on the left side you may find the Minimum price field; below the explanation:
Do not forget to set a minimum price, before you save!
We remind you that this value will not affect the price on the Calendar. It is just a minimum price, below which you never want to sell your room.
The minimum price refers only to the price you enter in the calendar (the cost for the stay only).
Talk to you soon!