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Width @MMC as a primary datum

I have got a problem how to "learn" PCDMIS 2012 MR1 datum features of ASME Y14.5-2009.
When I have drawing specified width as a primary datum @MMB what features I can use? I need to simulate "hard gage".
Mid plane doesn't work with MMB condition and slot or notch are not 3D (no vector).

Can anybody help, please?
psvobod1@hvccglobal.com