iirc the test part of Seam changed between those versions, so just trying to copy libs over might be an uphill battle. I'd recommend creating a new 2.0.2.SP1 project and copying your old src/view over.
Thanks for your answer. We thought about this solution too, but our problem is, that the whole project is under subversion control.
If there is no other solution, we have to create a new project.