Trouble with copying an object

I am trying to copy an object as follows:
First, I read the object (using the session not in a Unit of Work)
then, I modify the primary key
Finally I do a registerNew.
The result is a duplicate primary key error. I can examine the object that I am regisering as a new object and it does have the new key, but when I look at that SQL INSERT statement that is geting generated still has the old key.
I tried experimenting with the undocumented copyObject methods, but it still had the same problem. Any suggestions on what I am doing wrong.
Thanks,
JJ

Doug,
I have a related problem with copying. basically, I need to create a copy of an object for display to an HTML page. The user can then submit multiple changes. Once he/she decides it is good, a commit occurs. I was planning to use the copyObject() (using ClientSession) at the beginning and the mergeClone() before finally issuing commit() on the UnitOfWork.
The object that I'm working with has multiple levels embedded in it, such as
class1
+--- class2(multiple)
+--- class3 (multiple)
+-- class4(single)
If the object has references to non-private parts, how do prevent the copyObject() and the mergeClone() methods from going out of control and recursively trying to create clones. I'm asking because when the copy or merge is not limited to private parts, TopLink seems to want to copy/merge everything. Some of our tables have reverse references to other objects so the whole thing becomes one endless loop.
any help would be appreciated...
charlie

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