Simply identifying the easement by reference to the instrument number alone is probably not sufficient. That may be found to be identification but not description. It is recommended that words should also be used to describe the restriction (eg drainage easement or single dwelling covenant) and, as relevant, its location, preferably attaching a plan.
For example, a description of a right of way easement could be:
A right of way easement registered number T12345Z over the road shown marked R1 on plan of subdivision 1234567.
It is recommended that practitioners also attach a copy of the registered instrument to the section 32 statement.
In the example above the instrument attached would be the easement registered number T12345Z.