If, after the date when any right to which this section applies has become exercisable or enforceable, the right has subsisted for a continuous period of twenty years unexercised or unenforced ... then as from the expiration of that period the right shall be extinguished.
Subsection (1B) applies if—
The prescriptive period is extended so that it expires—
If the relevant claim (as finally disposed of) is successful, the right is to be treated for the purposes of subsection (1) as having been exercised or enforced by the creditor at the time when the claim was made.
This section applies to any right relating to property, whether heritable or moveable, not being a right specified in Schedule 3 to this Act as an imprescriptible right or falling within section 6 or 7 of this Act as being a right correlative to an obligation to which either of those sections applies.