Design Studio 1.6 SP1 with Universe as data source

Dear experts,

I am trying to understand the behavior of Design Studio and SAP Universe as data source.

Let's say I have 2 Dimension: Month and Year + 1 Measure: Revenue Growth %.

So my Query will have 3 objects: Month, Year, Rev Growth %

In my initial view I want only the Rev Growth %.

Now the behavior I am trying to understand:

1.      If in the initial view (which have live preview) I am adding the Year in Rows the result is a sum of %, which is wrong (12+15+9). It should be      recalculated for that specific Year.
2.      If I am adding setFilter (setVariable) for Year the result is also a sum and not recalculated.
3.      If I am removing the Month Dimension from the data source using BIAL then reload it the result is the same...sum of %

Does that mean that every time I am loading this data source the data is loaded in the Month,Year, Rev Growth % format and then Design Studio removes the dimension and sums the result based on the remaining ones?

So the only way to get the Rev Growth % for a specific Month then getting the Rev Growth % for a specific Year can be done only by using 2 different data sources? What if you have more dimensions? Do I need to create data sources for each combination?

What I try to achieve is to have a line chart where I show the Revenue Growth in % at Month level, then I want to give the user the option to switch it to Year level. The user also have the option to drill down at Country Level.

If this is the case I need to have 4 Data Sources?

1.      Month, Rev Growth %
2.      Month, Country, Rev Growth %
3.      Year, Rev Growth %
4.      Year, Country, Rev Growth %

Thanks in advance!