I know this is old, but just realised that the values that sum the total must be equal or less that the parent total, otherwise it won’t work you won’t see the graph.
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For example:
Child = 10, 12
Parent = 22
This will work fine. -
But:
Child = 10.50, 11.51
Parent = 22
This won’t work, as the sum of the children is 22.01
So round the values should help.