This is the author of the question:
This weird issue has been solved at last.
- in 11gR2 you don't select a module as Target/Source in the creation page wizard. (not sure where is it defined yet)
- do not follow the old tutorial, instead follow this for the new version:
OWB 11gR2 OBEs;
And i guess you should give specified permission to your target schema to select your source.
I won't remove the post in case someone else face same issue.
Have fun guys.