P purchased and registered absolute title to some land and sued D, a squatter for trespass. D counter-claimed for her overriding interest and rectification. D was granted this and P denied indemnity, on the ground that OI had already existed at time of P’s purchase, the rectification reflected the reality of and did not change the substance of P’s situation/title. It did not diminish P’s title and therefore P could claim no indemnification.