Hi Tomas and Daniel,
Did you manage to get this issue resolved?
I think there's been a couple of releases of the ArcGIS profile for Enterprise Architect since you first posted here. It may be worth retrying with the latest release (9.3 Build 931). The updated pdf tutorial might be of help as well (http://www.sparxsystems.com/bin/arcgis-enterprise-architect-uml-modeling-tutorial.pdf).
Either way let us know how it went, and we'll try post a solution for others that may have encountered this problem.
got it to work.
Also, in the EA model before export:
Assigned dataset IDs to all the feature classes (and the feature dataset)