Tom,
We have discovered the following while using Creo 2.0 with Windchill 10.1 M040. If the Creo model has been created and checked in, you can go into Windchill, edit attributes on this model by placing information in the attribute fields. These attribute fields are not parameters in the Creo model. They have been created in the EPMDocument MCAD master. Once you place this information in these fields, they automatically become designated parameters in Creo. These parameters show up in uppercase. They are not explicitly mapped.
This shows that non-explicitly mapped Windchill attributes, once given content manually, push into Creo parameters.