Jobs and Classes - The Bigger Picture

[Klive]

Can only use cross class abilities of half your lvl so chameleon ( lvl 42) and keen flurry (lvl 26)will not be available to monk.

Where does it say that?

EDIT: Closest thing I found to say that is this.

Using other class-specific actions (number)

When characters switch to a job, they can only equip half (rounded down) of the other class-specific actions. For example, a level 35 gladiator can normally equip seven class-specific actions from other classes, but a level 35 paladin can only equip three.