Product:
Microsoft Power BI desktop
Microsoft Windows
Issue:
Error when you try to add a measure in the visualizations list of data.
Solution:
Try to add a new column instead. The icons tell what type of value it is.
More Information:
Another important difference between measures and calculated columns is that measures are evaluated in the filter context of the visual in which they are applied. The filter context is defined by the filters applied in the report such as row selection, column selection, report filters and slicers applied. Measures are only evaluated at the level of granularity they are plotted at. As calculated columns are computed when you first define them/ when you refresh your dataset, they do not have access to the filter context. Calculated columns are calculated outside of the filter context and do not depend on user interaction in the report.
When you write a calculated column, you need to rely only on the row context. The row context, is simply the notion of a current row. It specifies which row we are calculating the values for, so that DAX can look at other values in the same row. In a calculated column, the row context is implied. When you write an expression in a calculated column, the expression is evaluated for each row of the table. The calculated column has knowledge of the current row.
By contrast, measures implicitly do not have a row context. This is because, by default, they work at the aggregate level. So, you cannot refer to columns directly in a DAX measure, you will get an error because no row context exists. This is because the measure will not know which row to choose in the table
https://endjin.com/blog/2022/04/measures-vs-calculated-columns-in-dax
https://biinsight.com/define-measure-table-power-bi-desktop/
https://exceleratorbi.com.au/conditional-formatting-using-icons-in-power-bi/