1. When an
obligation has arisen for a
third State
in
conformity with
article 35, the
obligation may be
revoked or modified only with the
consent of the
parties
to the
treaty and of the
third State, unless it is
established
that they had otherwise
agreed.
2. When a
right has arisen for a
third State in
conformity
with
article 36, the
right may not be revoked or modified
by the
parties if it is
established that the
right was
intended not to be revocable or
subject to
modification
without the
consent of the
third State.