When using SUMMARIZE() in DAX to create a grouped summary table, what additional function should be used instead of adding extension columns directly in SUMMARIZE() to avoid incorrect results?

Question

Power BI — Hard

When using SUMMARIZE() in DAX to create a grouped summary table, what additional function should be used instead of adding extension columns directly in SUMMARIZE() to avoid incorrect results?

Accepted Answer

When using SUMMARIZE() in DAX, adding extension columns directly can lead to incorrect results. Instead, wrapping SUMMARIZE() with ADDCOLUMNS() allows measures to be calculated after grouping. This approach ensures accurate calculations.