group by new column error

[giorgilomidze]

I'm trying to create simple group by

Sum cash in = GROUPBY(Table3,Table3[Industry],Table3[Month],"net revenue" ,SUMX(CURRENTGROUP(),[Net Revenue Vat included]))

but it gives me an error:  The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value.

[eniX · Accepted solution]

https://msdn.microsoft.com/en-us/library/mt163693.aspx

"Return Value:  A table with the selected columns for the groupBy_columnName arguments and the grouped by columns designated by the name arguments."

Group by returns a table, not a scalar value. This is exactly what this error message is saying.