My problem is exactly the same as you can read in this thread: stackoverflow thread
But there is a small difference. I try to explain it using the above thread's image.
The CS relationship contains C type objects as it is described, but also contains E type objects too, because the E type objects are derived from the C type object.
On thread's image the E type object is not present and this is the difference. The E type property also has a CS relationship.
The problem comes when I try to reach the E type object's CS property using the following query: SUBQUERY(bs, $x, ANY $x.cs.cs ....
The query is not finished, but the important code is there. As I observed, the predicate creation fails, because it tries to use the CS relationship on the C type object. I've tried to use the CAST operator on the $x.cs variable without success.
Do anybody has a clue for this?
Edit: Added image
The values of the MKMultiAttribute entity can contain MKAttribute and MKMultiAttribute types. And this is the problem, because the values is set to be a relationship to MKAttribute, but, because MKMultiAttribute is derived from MKAttribute the values can contain MKMultiAttribute entities and currently I can't call the values again.
