There is support for objects without ids.
PTC Creo Parametric
|Product / Module||
PTC Creo ECAD-MCAD Collaboration Extension
|Product Functional Area||
|User Interface Location|
|Processes, Initiatives, and Best Practices|
Benefits and Description
You can compare and incrementally exchange on objects which previously did not have object ids. Incremental exchange on holes, areas, and mechanical components, improves the exchange of information between ECAD and MCAD.