Hi Maryam,
The ultimate solution for this is to debug and find the place where to add the code.
LCPDII10 this is include where all your changes in ca02 are handled.
So put multiple break points in this include where ever you think the fields you want to track are used.
Then you could make out where you could place your code in that include.
After that find implicit enhancement spots in that include.
Then create an enhancement implementation and add your code in the implementation created.
thats all you are done with the req...
Thanks.
Dinesh.