Transaction XK02->Environment-Classification. To fetch the data changed here

Hi All,

I have a requirement where in I need to display the changes made to a vendor in the classifications under the environment tab, into a custom program created for showing enhancements.

The changes can be seen in the change document.

Where is this data stored actually or how can i fetch it so that the details of the changes done can be picked and displayed via this custome code?

Any inputs or suggestions will be highly appreciated.

Thanks