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  def validate_status_changes
    if changes.keys == ["status"]
      noop("Allow changes to the status only")
    elsif changes["status"].present? && changes["status"].second == "open"
      noop("Allow any changes when going to 'open'")
    elsif changes["status"].present? && changes["status"].first == "open"
      noop("Allow any changes when going from 'open' to another status")
    else
      errors.add_to_base(:cant_update_locked_deliverable) if locked?
      errors.add_to_base(:cant_update_closed_deliverable) if closed?
    end
  end