DAX Time Sameperiod last year

[DGTL]

Hello,

I can not calculate the sum of a column compared to the month of last year.

I used these two formulas. Each time it calculates me for the same month

Volume_M-1 = CALCULATE(

SUM('Bons de livraison'[Volume]);

SAMEPERIODLASTYEAR('Table Dates'[Date]))

Volume_M-1 = CALCULATE(

SUM('Bons de livraison'[Volume]);

PARALLELPERIOD('Table Dates'[Date];-1;YEAR))

I have a date table:

Table Dates =

ADDCOLUMNS(CALENDAR(DATE(2014;1;1);TODAY());

        "Année";YEAR([Date]);

        "Mois";MONTH([Date]);

        "Nom du mois";FORMAT([Date];"MMM YY");

        "Nom du jour";FORMAT([Date];"DDD d MMM YY"))

 Help please 🙂

[DGTL]

[DGTL]

help