Parallelism Measurement with Two Datums?

[[De...]]

Dear all,

Recently I receive some new request on measurements on parallelism using CMM.

This is my first time to see this kind of parallelism, with datum A-B

I used a simple drawing software to draw the drawings for better illustrations.

It would be appreciate if anyone can interpret this parallelism measurement to me.

And also the methods in CMM. T.T

This is so urgent and I have out of idea of it.

[[na...]]

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It looks legit to me according to ISO GPS, cannot test now, but I think Zeiss Calypso will handle that with GD&T Beta engine.

But, it would look a lot saner if design would define the now tolerated plane as a datum and require angularity of both other planes.