DAX Previous Month Function Not working

Hi,

Thanks for your response, but even though the name says month, it actually is a date fiel. i createde this sample data and made sure the format is date from the modelling options for the fiel.

All i was able to prodce was a grand total of previous month's sales. meaning, for the Previous month column  i see blanks agaist each month (After grouping by month for the date field) but there is a grand total which shows up for that column and the number is correct , it is sum of all the months except the first one!