Dear Prashanth ,
We have added 30 new fields to a standard table (Customer_H) , however these fields didnt get appended to the Data source structure 0CRM_SRV_******** . Hence we have asked BI team to enhance the DS manually, and i was told by them that SAP doesnt support nor suggest enhancing the standard Data Source Structure 
.....not sure if thats true, as i see so many blogs which demonstrate the DS Structure enhancement....
Is it true that SAP doesnt suggest / Support DS Structure enhancement ? do we have standard help documentation which i can use as a reference for my BI Team.
Regards,
Sweta