I just downgraded our installation to v1.6.1 (from 1.6.3) due to the source display issue and it raised a new issue.
The relationships aren't created anymore from the import. The mapping is the same and when i used it with the v1.6.3, it works fine and the relationships are created correctly.
Any way to fix this ? (Except switching back to v1.6.3 due to the source issue i can't solve because my plugin isn't working...)
Thanks in advance and sorry for the inconvenience !