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True Position of Datum Features to Each Other

Good Morning,

First , I am pretty sure that I am doing something wrong. I have a part that is a OD cylinder laying along my Y axis that is datum B. There is a ID cylinder that is drilled perpendicular to the OD cylinder that is datum A. Since I have 2 cylinders, I use them for my alignment constraining the 6 DOF. I then have a callout for true position of the Datum A to Datum B and the measurement is 0.0001". Is the reason for such little deviation because I am aligning to those features?

Second is the true position callout. I think I need another datum there such as a plane to stop translation. See attached.

DC_ALIGN =ALIGNMENT/START,RECALL:MAN_ALIGN,LIST=YES
ALIGNMENT/LEVEL,YMINUS,DC_BODY_CYL
ALIGNMENT/ROTATE,ZPLUS,TO,DC_BORE_CYL,ABOUT,YMINUS
ALIGNMENT/TRANS,XAXIS,DC_BODY_CYL
ALIGNMENT/TRANS,ZAXIS,DC_BODY_CYL
ALIGNMENT/TRANS,YAXIS,DC_BORE_CYL
ALIGNMENT/END​






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