Data points insertion error. Only 1 Y values can be set for this data series

[tznind]

Describe the bug

If there are a large numer of diverse pivot values in an AggregateConfiguration graph then you can end up with the below Exception. I think this comes from mixed case or punctuation that would be removed when turned into DataColumn headers colliding with another column.

We need to reproduce the issue, report errors when we add the series (e.g. could not add series called 'x' because.... or ideally just add it to it's duplicate.