Cumulative Sum for grouping & wrong calculation?

Hi there,
I’m new to knime and the forum. This is my first post, so I’m not sure if this is the right category for my question.
I added a new column based on a column “umsatz” with the help of the cumulative sum for grouping node. Surprisingly the calculation of that is not as I expected…

I guess it has something to do with the Sorter as it goes wrong beginning with row1030.
But I put the sorting to “buchungstag”. I thought the node would then use the sorted table row by row

Is there an alternative way for getting a cumulative sum?

This node my be what you need


That works, thanks !

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