Thanks Martin for the information.
I see in SCU3 that TBDLS is activated for change logs and though see the log information in our development and UAT system. But in prod, there are no logs and it gives a message
" BC_DBLOGS Archiving Customizing table changes No data available "
Does the archive logs have been deleted ? How can I find this out ? Not sure if its SARA tcode or any program or table it is will give me..