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I suspect that the problem is quite simply that the modulation wheel is supposed to act as a modulation wheel, not a pitch wheel. Therefore, even if signals from it are getting through the MIDI interface, they are getting through as modulation control signals.
The CMK-149 has both pitch and modulation wheels, but yours apparently only has the modulation wheel.
Try setting the XP60 to something like
SOURCE: CC01: MODULATION
so that it will pay attention to modulation signals on the MIDI input. That's how I've seen a Roland set up to pay attention to the "Continuous Controller 1" i.e. Modulation Wheel.