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How is concentricity calculated on pc-dmis?

So I've read multiple post on this same question, but nothing really explains what PC-Dmis is doing that i saw.

I have a print for basically a cup. Its calling out concentricity of the outside of the part to a cylinder on the inside of the part( datum a is a larger cylinder at the top of the part on the inside)

The outside the diameters check out of location from 0 but its not matching the concentricity. (is the deviation still x2 as radial distance from center?)

Datum A is X = 0.00 Y= 0.00

OD is  X= 0.0004  Y= -0.0013

Concentricity to A = 0.0218

Where did the 0.0218 come from?

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