Error in <expression> part in LASTNONBLANK function.

[PelaezLink]

Hello everyone.

So I have the following DAX expression for a measure:

Measure = LASTNONBLANK(FACTCooperativa[Year]; FACTCooperativa[Ratio9PACA])

Basically in FACTCooperativa table I have an ID column, a Year column (which ranges between 2016 an 2020) and then some columns that represent values of certain ratios for each year and each ID number. This table always has a filter on, making it only have the date for one ID number. In reality the table has hundread of rows, 5 for each ID number (year 2016-2020) but because of the filter the table is all the time only with 5 rows. The thing is I want the Measure to give me the last year in which the value of 'Ratio9PACA' is not blank, but I get an error alway in the second part (<expression>). I do not know what is causing it. Error says:

"A single value for column 'R9PACA' in table 'FACTCooperativa' cannot be determined. This can happen when a measure formula refers to a column that contains many values without specifying an aggregation such as min, max, count, or sum to get a single result."
I tried using the SELECTEDVALUE for the expression part but is not giving the correct results.

Thanks for all the help in advance.

[daXtreme · Accepted solution]

@PelaezLink 

Please have a look at the documentation first.

There are also examples of how to use this function -> LASTNONBLANK – DAX Guide

Assuming that certain conditions are met by your design, this might do the job:

[Measure] = 
LASTNONBLANK(
    FACTCooperativa[Year],
    // You need a context transition here.
    CALCULATE(
        SELECTEDVALUE( FACTCooperativa[Ratio9PACA] )
    )
)

[PelaezLink]

Thank you very much that worked perfectly. I dont really understand why with CALCULATE does work but it does.

[daXtreme]

@PelaezLink 

Please learn about context transition. Then you'll understand. Start here: Understanding context transition in DAX - SQLBI