Problem extracting month to calculate previewsmonth

Hello everybody.

I´m having problems to calculate the sales amount of previews month.

I Combine the month and the Total Sales:

After that, I apply this formula:

Total Ventas MA = CALCULATE([Total Ventas];PARALLELPERIOD(vFrmEstadisticaFVDetalladaA[FechaFactura];-1;MONTH))

To calculate the previews month.

When I put in a table the total sales of the previews month, it´s give me te total, but no by month:

Can somebody help me?

Thank you very much!!!

jd