It is, CS25.1325(e), which I'm aware of...
(e) Each system must be designed and
installed so that the error in indicated pressure
altitude, at sea-level, with a standard atmosphere,
excluding instrument calibration error, does not
result in an error of more than ±9 m (±30 ft) per
185 km/hr (100 knots) speed for the appropriate
configuration in the speed range between 1·23
VSR0 with wing-flaps extended and 1·7 VSR1 with
wing-flaps retracted. However, the error need not
be less than ±9 m (±30 ft).
Whilst it shows a range, it does only show "speed".
G