PivotTable vs PivotChart - areas settings

Hi,

I have what I think is a very basic problem...but I can solve it. I have played with the settings with no result.

If you look at the example attached, you will see a chart with 1 column for the X axis, and 2 columns for the Y values.
I have created a very basic PivotTable, whose purpose is only to display the values from the chart. The content displayed is what I want (the plain values only). Nevertheless, I am not sure that the Value Field Setting is correct for my purpose.
My doubts come from when I create a PivotChart from the PivotTable. The first set of data from the field dragged in the "Σ Values" area is correctly displayed in the graph, but the second one dragged there is not. For this last one, it is the sum of the 2 sets of data for a given X.
Ultimately, a correct graph is my goal.

I would appreciate any help pointing me to where I am wrong.