Group by integer to double empty sum

Hi,

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