Hi Hertner ,
1. I need to display the total sum above of the stapel e.g. 3 stacked values.
by default you can't.create 3 blanks cell with your measures and place them exactly on the bar.(little formatting may required)
2. The 3 values are stacked in order max to min but the legend changes not in the corresponding order. It stays on the original order.
If I understand correctly ,you are looking for change in the key figure order .This you can change at the assign data - change order of display ,
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3. Could I implement a user specific color palette?
No.Only one pallette for chart
