Getting Value Sum from previous week

Hi 

I have been trying to get values for previous week, unfuntuanlly it was not as easy as getting from previous month, with previousmonth function.

I alreday used a grouped date on the left side as currently date/week.

I have tried use datesbetween and use dateadd filters but they seems unable to collect values outside the current date.

CALCULATE(sum(table[Quantity]), DATESBETWEEN(table[7Days], DATEADD(FIRSTDATE(table[CurrentDate]),-7,DAY),DATEADD(LASTDATE(table[CurrentDate]),-7,DAY))

But if I use static value date(Year,Month,Day) for the startdate and enddate in datesbetween, I was able to get value outside the currently date.

Note: 7days is grouped CurrentDate

Any suggestion is appreciated.