The defendant in an action for wrongful interference shall be entitled to show, in accordance with rules of court, that a third party has a better right than the plaintiff as respects all or any part of the interest claimed by the plaintiff, or in right of which he sues, and any rule of law (sometimes called jus tertii) to the contrary is abolished.
Rules of court relating to proceedings for wrongful interference may—
Subsection (2) is without prejudice to any other power of making rules of court.