18Variations and discharges of land obligations
(1)The terms of any—
(a)deed recorded in the Register of Sasines, whether before or after the commencement of this Act, whereby a land obligation is varied or discharged;
(b)registered variation or discharge of a land obligation,
shall be binding on the singular successors of the person entitled to enforce the land obligation, and of the person on whom the land obligation was binding.
(2)In this section " land obligation " has the meaning assigned to it by section 1(2) of the [1970 c. 35.] Conveyancing and Feudal Reform (Scotland) Act 1970.