90.6

a) Any appointment of an agent or common representative may be revoked by the persons who made the appointment or by their successors in title, in which case any appointment of a sub-agent under Rule 90.1(d) by that agent shall also be considered as revoked. Any appointment of a sub-agent under Rule 90.1(d) may also be revoked by the applicant concerned.
b) The appointment of an agent under Rule 90.1(a) shall, unless otherwise indicated, have the effect of revoking any earlier appointment of an agent made under that Rule.
c) The appointment of a common representative shall, unless otherwise indicated, have the effect of revoking any earlier appointment of a common representative.
d) An agent or a common representative may renounce his appointment by a notification signed by him.
e) Rule 90.4(b) and (c) shall apply,mutatis mutandis, to a document containing a revocation or renunciation under this Rule.