Geometry best fit constraints

[[Am...]]

Hi everyone, quick question working with some profiles that are not fully constrained. When I make a geometry best bit and im selecting my constraints, are the xyz and axis relative to the coordinate system of the alignment the best fit is referencing or of the coordinate system of the considered feature?

[[Is...]]

Not sure if this answer your question:

When you make bestfit: the actual values will change and the Nominals will keep in the same position.

The translation and rotation values are referenced to the coordinate system selected in the curve feature.

[[Cl...]]

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When you say; "not fully constrained", what exactly do you mean?.
Profiles with no datum reference?

The reason I ask is, my understanding is that the constraints are
applied only to profiles were there are no
datum's involved?

I still don't understand when and why you would use them?

[[Am...]]

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Its actually im trying to make sure I don't constrain it in a way that isn't intended. If the profile call out does not fully constrain the datum reference frame from what I remember in the zeiss profile training is they don't recommend using the secondary datum as the tertiary datum because calypso will not give you all of the leniency intended on the callout. What they did was make an secondary alignment based on your DRF on the profile call out and then making a geometry best fit referencing that alignment with your feature in the elements use the evaluation constraints to uncheck the constraints that are not being constrained for it to accurately calculate the profile with the intended degrees of freedom.