Presuming you are using a newer version with GeoTol instead of XactMeasure, GeoTol adheres to the standard very tightly.
Your alignment is not allowed by the standard (as interpreted by Hexagon, I'm not making a claim that they are wrong in their interpretation, just pointing out that other people might read the standard differently. If standards were written perfectly so everyone understood them the same, they'd never need to be revised.).
From your vague description (and I'm not expert in the standards as written, though I understand their intent fairly well), I'd say you have a two-dimensional secondary datum (line, or a circle that makes a line from some other point/circle) which is not within the plane of the primary datum's two rotational constraints, causing an issue with the rotation, so GeoTol is stopping there and not allowing the third axis.
Could be that the drawing was made before the mathematical definition was realeased and won't work anymore, could be that the engineer didn't understand the standard and made a FCF that can't resolve strictly held to the standard, could be that you should have used all 3D elements for your FCF and you'd be ok.
I'd start with making sure your primary, secondary and tertiary are all planes or cylinders.
If all else fails, go to Legacy and be RIGHT about your alignment.
Presuming you are using a newer version with GeoTol instead of XactMeasure, GeoTol adheres to the standard very tightly.
Your alignment is not allowed by the standard (as interpreted by Hexagon, I'm not making a claim that they are wrong in their interpretation, just pointing out that other people might read the standard differently. If standards were written perfectly so everyone understood them the same, they'd never need to be revised.).
From your vague description (and I'm not expert in the standards as written, though I understand their intent fairly well), I'd say you have a two-dimensional secondary datum (line, or a circle that makes a line from some other point/circle) which is not within the plane of the primary datum's two rotational constraints, causing an issue with the rotation, so GeoTol is stopping there and not allowing the third axis.
Could be that the drawing was made before the mathematical definition was realeased and won't work anymore, could be that the engineer didn't understand the standard and made a FCF that can't resolve strictly held to the standard, could be that you should have used all 3D elements for your FCF and you'd be ok.
I'd start with making sure your primary, secondary and tertiary are all planes or cylinders.
If all else fails, go to Legacy and be RIGHT about your alignment.
