If the applicant satisfies the Registrar-General that proper grounds, as set
out in section 223A, exist for altering the applicant's certificate or
the certificate of any other person, or both such certificates, he shall grant
the application: Provided that—
(a)
where an alteration of the applicant's certificate would affect land included
in the certificate of any other person, the alteration shall not be made
unless that land was included in that other person's certificate by reason of
error in survey or misdescription; and
(b)
where the title to the land affected by the alteration has been determined in
a contested proceeding in a court of competent jurisdiction, the
Registrar-General shall not make any alteration inconsistent with the
determination of the court.