Regarding the ADRC table

Hello Experts.

There is an entry in ADRC table, but no Change log history in CDPOS and CDHDR table.

1. How many ways are there to update/insert the address into the ADRC table.

2. Is there any other table or way to see the change log for address.

3. What is the Service address in IS-U.

4. Why there is no Change log in CDPOS and CDHDR eventhough for all the DataElement used in the ADRC table checked the 'Change document' option.

Thanks in advance,

Umashankar