Need History of Role Delegation details of an employee

Summary

Need History of Role Delegation details

Content

Hi Team,

We have a requirement like one manager delegated his roles to 20 people but suddenly those role delegations are not available so we need to find out who have done the changes/ deleted the delegations. is there any possibility to find out the who delete the delegations

I have used below tables to get the data from BI but these table are not providing data who done the deletion 

PER_DELEGATED_ROLES DELG , PER_USERS USR , PER_ROLES_DN ROLE , PER_ALL_PEOPLE_F APPL , PER_PERSON_NAMES_F NAME , PER_ALL_PEOPLE_F APPLD , PER_PERSON_NAMES_F NAMED