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Problem using python function when trying to build a chart widget.

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Hello, 

I have built a function in Python, which calculates the cumulative sum of a column of a dataset, but I have a problem when applying it in a chart widget (attached screenshot). however, when I build a table and apply the function, it works,funciton_error_when_charting

Has it happened to anyone else or do you know how to solve it?

Thanks in advance!

Environment Knowage 8.0.9, knowage-python=8.0.2
in Charting by (290 points)

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