(1) The order of priority may be altered subsequently.
(2) For the change of priority, the agreement of the person entitled who takes lower priority and of the person entitled who takes higher priority and the entry of the change in the Land Register are required; the provisions of section 873 (2) and section 878 apply. If a mortgage, a land charge, or an annuity land charge is to take lower priority, then the approval of the owner also is required. Approval is to be declared to the Land Registry or to one of the parties involved; it is irrevocable.
(3) If the right taking lower priority is encumbered by the right of a third party, then the provisions of section 876 apply accordingly.
(4) The priority accorded to the right that takes higher priority is not lost as a result of the right that takes lower priority being cancelled by legal transaction.
(5) Rights the priority of which is between that of the right taking lower priority and the right taking higher priority are not affected by the change of priority.