Changes made to DTP

Hello everyone.

few months back i made some changes to one DTP like, i changed the settings for error handling, increased the size data package, included some semantic groups.

But, now i didnt remember the changes i have made do my DTP.

Is there any way to know what changes we have made to current DTP earlier??? means, can we know what changes we have made to DTP exactly??

Thanks,

Chakradhar.M