I think that Magic Draw is using MDR as UML Supertructure which is not
really compatible with EclipseUML 2.
You have to manually write a parser and then use other open source
projects to transform it.
This is not an easy job !!!
Note that Omondo did the same job two years ago by creating a parser from
UML 2.1/UML 2.2 to UML 2.0 which was AndroMDA compatible.
The estimated project was only 3 months for one full time developer and
the reality was 12 months for two engineers.
We still have sometimes compatility problems and the job is never perfect.
The best is not to use MDR anymore and only select EclipseUML2
Superstructure like RSA, Borland, Omondo did it would make life easier :-)
Good luck for your project.