Integration

Hi,
I have problem with order of delete command in many-to-many relationship.
(JDev 10.1.2, TopLink - 10g (9.0.4.5) (Build 040930))
Let we assume class schema:

Role (N) ------> (N) Task
User (N) -------> (N) Role
User (N) -------> (N) Task

Mapping is many-to-many via relation table (R_RoleTask, R_UserTask, R_UserTask).

Java code
uow.deleteObject(userOne);
uow.deleteObject(userTwo);
uow.deleteObject(roleOne);
uow.deleteObject(taskOne);
uow.deleteObject(taskTwo);
uow.deleteObject(taskThree);
uow.commit();

produces sql
DELETE FROM R_ROLETASK WHERE (ROLE_ID = 13256);
DELETE FROM ROLE WHERE (ID = 13256);
and of course ends with ORA-02292: integritní constraints....

What is magic: last week worked it fine!
DELETE FROM R_USERTASK WHERE (USER_ID = 13303)
DELETE FROM R_USERROLE WHERE (USER_ID = 13303)
DELETE FROM USER WHERE (ID = 13303)
DELETE FROM R_USERTASK WHERE (USER_ID = 13302)
DELETE FROM R_USERROLE WHERE (USER_ID = 13302)
DELETE FROM USER WHERE (ID = 13302)
DELETE FROM R_ROLETASK WHERE (ROLE_ID = 13306)
DELETE FROM ROLE WHERE (ID = 13306)
DELETE FROM TASK WHERE (ID = 13304)
DELETE FROM TASK WHERE (ID = 13305)
DELETE FROM TASK WHERE (ID = 13307)

No change in table definition, no change in TopLink mapping, no change in JDev&TopLink version.
The only one new thing - I created new table and add mapping to TopLink.

So. I think TopLink orders all deletes using the constraints defined. This is right for 1:1 and 1:N. But for N:N?
What can I do?
I tryed addConstraintDependencies, but it don't help.

Thanks for any hint.
Jara