but do you have an
official definition of "rating limitation" to use to properly understand
61.31(k)(2)(ii)?

No, but the definition of rating is implicit in its use in that same
section. 61.31.... (a) type rating required... (c) aircraft category,
class, and type ratings... (d) aircraft category, class, and type
ratings... and then (e), (f), and (g) specify "training", not "rating".

Jose
--
The price of freedom is... well... freedom.
for Email, make the obvious change in the address.