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Ok... As I said I'm fairly sure that there is no functionality exposed through the API to examine a constraint before it has been placed. I don't really know how this constraint preview you get while setting constriants manually works, but I'm thinking that probably this would be very slow in your case as well...

 

Maybe it wouldn't be as slow if you performed the update "silently" (don't update the view)

InventorVb.DocumentUpdate(False)

And then check the health status of the constraint? :thinking_face: