I don't see a way to remove duplicates easily. I know you can inspect the intent and do a measure between the two intents and that is what I'm going to do on my current project but it would be nice to be able to see the value on the member from the origin or have a method to allow/remove duplicates on the ordinateset.
API
https://help.autodesk.com/view/INVNTOR/2025/ENU/?guid=GUID-OrdinateDimension