With some copyed old wtparts we see that there are multiple values for a single attribute in Windchill, see screenshot.
Can anyone explain this ? Can this be an inheritance from the Intralink time ?
Does the attribute have a Single Value Constraint associated with it? If not (or if the constraint was added after the multiple values were added) that would explain this behavior.
That would explain why the attribute has allowed for multiple values. You can add the constraint and then remove the extra values.