Numbers rounding problem in query

Hi CogitaHungary ,

The Decimal number data type in Power BI can sometimes lead to rounding due to its handling of floating-point numbers, which store values as approximate data types. This approximation can result in precision loss, especially when new data is added during a refresh.

To minimize this problem, I suggest changing the data type of the columns to fixed decimal numbers. This data type has a fixed decimal separator position, and precision can be improved by customizing the number of digits to the right of the decimal separator, thus avoiding unnecessary rounding.

In the Power Query Editor, select the column you wish to change.
In the Transform tab, find the Data Type dropdown and select Fixed decimal number.
This action should help preserve the precision of your data when it's refreshed from the Excel source file.

Best Regards,
Dino Tao
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