Insert/Update related tables

Hello,
I am attempting to take XML data - and using a transform, map it to a DB Adapter "merge" (insert if new, update if not) on two related tables. I have set up my db tables as follows...
Table A
ID (unique, primary key)
param1
param2
Table B
ID (foreign key related to Table A - ID)
paramA
There is a "TableA 1:M Table B" relationship set up in the DB as well as in the DB adapter TopLink project.
If I do an initial "merge" (insert), everything works fine - and I get my new record in Table A - and several new related records inserted into Table B (way cool!).
However, if I then try to repeat the merge after modifying something in the incoming data that is associated with Table B data, Table B records associated with that ID all get set to the last instance of Table B data in the input. I know that's confusing - here's an example...
Initial input:
<CAR>
<ID>7</ID>
<param1>Chevrolet</param1>
<param2>Corvette</param2>
<paramA>T-top</paramA>
<paramA>Mag Wheels</paramA>
<paramA>Hood Scoop</paramA>
</CAR>
Resulting Table Data:
Table A:
ID param1 param2
7 Chevrolet Corvette
Table B:
ID paramA
7 T-top
7 Mag Wheels
7 Hood Scoop
Second run with the following input:
<CAR>
<ID>7</ID>
<param1>Chevrolet</param1>
<param2>Corvette</param2>
<paramA>T-top</paramA>
<paramA>Mag Wheels</paramA>
<paramA>Front Hood Scoop</paramA>
</CAR>
Resulting data in DB...
Resulting Table Data:
Table A:
ID param1 param2
7 Chevrolet Corvette
Table B:
ID paramA
7 Front Hood Scoop
7 Front Hood Scoop
7 Front Hood Scoop
I have verified that my XSL transform appears to be working correctly.
Am I using the db adapter "merge" function for something it's not designed to handle (i.e. related tables)? Do I have to code separate update adapter instances to update my related tables individually? I hope not - I was hoping TopLink would just take care of this for me. Maybe I'm too optimistic... ;-)
Thanks for any help!
Lon

Nevermind. I'm an idiot.
Obviously, Table B needs another column to form a unique key - so an update can change just that row. Sorry for wasting your time. :(
Lon

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