Group by integer to double empty sum

I’m not sure I understand what happened.
I used node Group by .
Aggregation was used sum. After the first run it warned me that I need to convert to long it didn’t help. So I converted to double it didn’t help either.
I loaded the data from excel where I changed integer to double.
Load went fine so I connected the GROUP BY node while setting the calculation in “GROUP BY” from type double became integer see picture.
I am not sure where the error is .
KNIME version 4.7



Hello @MarekV ,
Could you please share a dummy workflow with dummy data (if your data is confidential) so that we can have a look at it?


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OK I will try simulate somehow

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