There may be circumstances where you need to change the property in your dataset which is used as the Unique ID.
You can identify which property this is in the Property pane. It has a node icon alongside it : -
To change the to another property, say the ID property, simply tag the ID property with
Click OK in the Property tags pop up box, then OK in the Edit Property pop up, and finally click Refresh (top left of the toolbar).
This will reassign the property identified as the Unique ID to the ID property.