Average of measure not working

I have created a analytical view. The data foundation contains HANA table ZCPU - fields 'Date', 'Start time', 'User', 'CPU_Time(msecs)'

1)In logical Join, few calculated columns- 'DayNo','Month','Year'- are created from field 'Date' ..

2)CPU field aggregation type is SUM.

But I want monthly average of the CPU time, So i used IDT to create a universe where projection type of 'CPU_time' is changed to Average.

Now,I created query with:

Result should be average CPU_time for month. Problem is I still see the sum of CPU time in IDT query? 

When I execute below query, it works fine:

Requirement is monthly average CPU time report. How to deal with the average functionality?

Thanks,

Charu