My apologies, now I get you.
It seems the priority lies with whatever you changed last.
If you changed the PCM wave via the WaveSel/PW knob whilst the Osc Shape knob is <64, then that method of selecting a PCM wave will take priority (and it will also alter the same PCM wave value in the edit menu accordingly to reflect the new value at the same time).
However if you dived into the menus and altered the PCM wave value that way last (even if the Osc Shape 64>), then that would steal priority.
To get to the crux of it: the latter is to assign PCM wave selection to its own MIDI control, which is ideal if you wanted to change the PCM remotely (via MIDI) when the Osc Shape is 64> in order to prime the PCM waveform ready for a seamless blend if you happen to decide to sweep the Osc Shape value back into PCM realm (Osc Shape <64). Otherwise there'd be an audible glitch or two as you suddenly start messing around with sending WaveSel/PW values when the Osc Shape was suddenly back in range just in order to select a new PCM wave.
You can already modulate PWM via MIDI, so you don't need a dedicated sub menu option for PWM alongside PCM wave selection too.
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