Removing from flattened relationship without "reverse" always fails
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                 Key: CAY-1386
                 URL: https://issues.apache.org/jira/browse/CAY-1386
             Project: Cayenne
          Issue Type: Bug
            Reporter: Andrey Razumovsky
            Priority: Critical
             Fix For: 3.0RC3


Imagine there is many-many rel between tables A and B using join table C (no 
ObjEntity). There is flattened rel bArray from A to B with delete rule cascade 
(if that matters) but no reverse. 
Adding to such rel goes perfect:
INSERT INTO B
INSERT INTO C

But deleting B does 
DELETE FROM B
which obviously fails.

Haven't digged into code much, but it seems arcDeleted() isn't invoked for B 
and therefore relationship isn't recognized as flattened.
Since reverse rels aren't mandatory in Cayenne, this should work

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