One-to-many mapping and update the many part

Hello !
Here's my problem,
I've got an object A having a vector of object B.
The mapping in toplink is one-to-many with the back-references set in B.
Insertion : no problem.
Now i would like to change the Vector of B (inserting new B, updating existing B) in a function with the Vector vC (modified vector of B).
What is the best way to do this ?
I tried many thing but either I have toplink 6004 error, or doing it by removing all elements of the Vector (deleting all B in database), and then setting A with C (recreating all object in the modified Vector).
Another way to explain my case:
how to do this in UnitOfWork ?
function modifyAVectorOfB(A, vectorOfC)
AClone = uow.registerObject(A);
Aclone.setVectorOfB(vectorOfC);
uow.commit;
(and in database all existing object in C are updated, new object in C are created, removed object in C are deleted)

Have found a solution, read all object in the modified Vector, read the modified object in the Unit Of Work with readObject(B) (So i get the database or cache version) and then comparing it with the modified to change what is needed to be change.

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