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The argument HandlingCode is defined as out. Set its value is required. If you don't want to cancel this change, set its value to kEventNotHandled.
For more information see the API specification of OnChange event

https://help.autodesk.com/view/INVNTOR/2020/ENU/?guid=GUID-45C2F0C0-6B5D-413A-9359-9DFD86E3A764