Graph output not showing Correct

Hi sakshikaul ,

In order to make the data output correct, I created a table to store the 12 months from January to December. Associate it with the month column of the DBALLSTAT table, and set the filtering direction to single. Then modify the measure:

previous year = 
var Selectvalue =    
CALCULATE(
        [SelectYear],
        FILTER(
            ALL('DBALLSTAT'),
            'DBALLSTAT'[Eco_year] = MAX('DBALLSTAT'[Eco_year])-1
            && DBALLSTAT[Month] = MAX(DBALLSTAT[Month])
        )
    )
var notselect = 
    CALCULATE(
        [SelectYear],
        FILTER(
            ALL('DBALLSTAT'),
            'DBALLSTAT'[Eco_year] = MAXX(ALL(DBALLSTAT),'DBALLSTAT'[Eco_year])-1
            && DBALLSTAT[Month] = MAX('Month'[Column1])
        )
    )
return 
    IF(
        ISERROR(ALLSELECTED(DBALLSTAT[Eco_year])),
        notselect,
        IF(
            ALLSELECTED('DBALLSTAT'[Eco_year])=2021,
            notselect,
            Selectvalue
        )
    )

In my sample data, I have successfully fulfilled your requirements, please check the PBIX file for more details.