Backup report

Hello,

I am having difficulty generating the daily backup size/ duration report from Opcenter. The problem is, as since any backup activity comprising of so many jobs specially in the case of RMAN/ SQL and if we apply the filter to choose parent job only then it will not show the size/ duration as its not associated with parent job. Many other issues as well like if applying the filter by schedule name then many FS backup starts with no schedule name as just   -   in schedule column.

Please help.