The values from same period last year come in blank

[Act_Nico]

Hello friends, I would like to generate data from the same period last year in the same record of the current year. The problem is that I need to summarize the base table to then calculate the average of the required field:

TEST =

VAR Var_A =

        SUMMARIZE(DATA

                , DATA[NUMPOL]

                , DATA[MES_INI]

                , DATA[MES_FIN]

                ,"Prime"

                , CALCULATE(

                        SUM(DATA[Prime])

                        ,SAMEPERIODLASTYEAR(Calendario[Date]))

        )

VAR Var_B =

        AVERAGEX(Var_A,[Prime])

RETURN Var_B

But the result generates a blank column of values, 

I am quite rookie on DAX functions and I would like some help please

[Dangar332]

hi, @Act_Nico 

add Calendario[Date]) column to your summarize in var_A

[Act_Nico]

Hi @Dangar332 , I couldn't add that column, it's weird because I have a many-to-many relationship between both tables