In my app., EntityAFromModel1 si fetched directly. Then the details (EntityBFromModel1 and EntityCFromModel2) are
fetched.
The MySQL command for EntityAFromModel1 and EntityBFromModel1 are ok. Then an errors occurs before the Oracle command
is send.

I have fixed this by implementing in EntityBFromModel1.awakeFromFetch(..) the fetch of the EntityCFromModel2's object
needed by the relationship.
It seems to me that if the EntityCFromModel2 are already fetched, EOF don't have problem to use them.