With MagicDraw 10, we moved from the UML 1.4 metamodel to UML 2. It is very important to become familiar with these changes before migrating your projects to UML 2, as this is a significant change.
We've put all our best efforts into implementing the UML 1.4 model migration to version UML 2. However, the new standard is not backward compatible. Situations may occur where the migration facilities may not import 100% of the model and data loss may occur.