Let the database doing cascade deletion for privateOwned relationship

Hi,
I have two tables: parent, child. I mapped the parent to child as a one-many private owned relationship. The child table have a foreign key reference back to parent table. The constraint is like this
alter table child add constraint FK_CONSTRAINT foreign key (parentid) reference parent (parentid) on delete cascade;
I would the cascade deletion is done by database (as it is "on delete cascade" in the constraint) rather by the toplink. (This is exactly what you will do when use JDBC. another reason is that if I let the TopLink do the cascade deletion, I got a deadlock! If I remove the cascade deletion from topLink, I do not have the deadlock).
Is there anyway I can turn off the cascade deletion from topLink, but at the same side keep the private owned relationship(because it is indeed privately owned)?
Any help is really appreciated.
jason

Setting a no-op sql solves the cascade deletion problem. However, if I really want to remove a child from the parently, I ends up using the same no-op sql. I can not delete child independently.

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