Correct... I am not talking about aircraft AFM limits (our aircraft has only "demonstrated values") but CAT II crosswind limits imposed by Transport Canada and the FAA due to the ground based equipment, which stipulate a max crosswind of 15 knots at the touchdown point while making a CAT II approach.
Jet Jockey, I believe the 15 kts default limit imposed by TC / FAA is not solely based on ground equipment limitations. They may be exceeded if the aircraft can handle stronger winds, if documented in the AFM and/or OpSpec as appropriate.
To certify airborne equipment for CAT I & II, the manufacturers must show that they can meet certain performance standards when there's a crosswind of at least 15 kts, tailwind of 10 kts and headwind of 25 kts -- all measured at the touchdown point and must be repeatable when conducted against several representative ground systems.
These are the minimum values required for certification so they're also the standard value in the OpSpec template. However TC & FAA can certainly approve higher limits if the aircraft / crew / procedures are capable of achieving more.