No Denti - it does not, though it may be a company restriction of yours - from the Boeing NG FCTM:
"CAT II Operations
Category II approaches may be conducted using single or dual autopilots, or flight
director only, with two engines. For single autopilot operation, the autopilot must
be disengaged no lower than the minimum altitude listed in the Limitations
Chapter of the Operations Manual. Autothrottles should be disconnected when the
autopilot is disengaged"
The query is about A/P disengage height, not number of channels.