how to get the change date of architectural object

Hello ,

Is there a way to get the change date for architectural object ? For example when we create a new WBS (PS assignment) for the architectural object

we need to pull this date .

I can find the last edited date in VIBDAO .But this is not the one i wanted , since i wanted to get the date  when a PS assignment is created or changed .

Kindly suggest .

Thanks,

pradeep.