Hello, thanks for replied !
In my case I don't need more than 2 dimensions. 2 would be enough to get clustered and stacked bar :
One dimension global : The date
The other one for the group : The type
The stacked would only need these two dimensions and all measures that have to be stacked.
The problem is I can't set two dimensions in bar chart. Only one is allowed
For now, I use the concat strings to get my "clustered" (even if they are not really clustered) and stacked bar chart