Integrity constraint child record found

TopLink Version: Oracle TopLink - 11g Release 1 (11.1.1.0.0) (Build 070323)
I may be going crazy here, but I keep getting an integrity constraint when I try to delete an object that has 1:M relationship (Resource 1:M Attribute):
Internal Exception: java.sql.SQLException: ORA-02292: integrity constraint (WEBCENTER.WP_RELATIONSHIP_RES_FK) violated - child record found
The child object attribute is set to "Private Owned", and there is an FK from the child table to the parent table in the database (this is where the integrity constraint violation is coming from).
I query for the Resource, register it in the unit of work, call UOW.deleteObject(resource), and then call UOW.commitAndResume(). TopLink is making a sql call to delete the Resource, but it does not first delete the privately owned Attributes which results in the FK violation.
It should delete the child records first, right?
In addtion to having the attribute set to "Private Owned", I also have set:
Batch Reading
Use Indirection
Transparent
Not sure if that makes a difference.

Use a trigger. Example:
CREATE OR REPLACE TRIGGER update_parent_chilren
BEFORE UPDATE OF pkey_column ON parent_table
FOR EACH ROW
BEGIN
UPDATE child_table
SET fkey_column = :NEW.pkey_column
WHERE fkey_column = :OLD.pkey_column;
END update_parent_children;
null

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