material master classification view

hi everyone,

i need to create an object class related to the classification tab of the material master. for every change that will be done on the classification tab of the material master, the changes will be reflected in CDHDR and CDPOS tables. i have already created a change document object and have generated the necessary include programs and function module. the problem now is on how to utilize the function module so taht every time the classification tab is changed, it will reflect the changes in CDHDR and CDPOSD via the change document object created.

i also need to know old values of the material in the classification tab and the new values of it. can you please help me out to know the old values of AUSP table and the new table(the one containing the data before i save my entry)?

thanks.. any help would be highly appreciated...