Stopping Line Graph to current month

Anonymous 

Apologies for that...The variables aren't what you need.

Do you have a YearMonth column in your Calendar Table? (if not, please add one using the "following" DAX:

YearMonth = Calendar[Year] *100 + Calendar[Month Number]

and format it as a whole number.

For illustration purposes, I'm using a dummy model, so please adapt to yours:

Cumulative measure (no need to change yours):

Cumulative Forecast = CALCULATE([Sum of Forecast];
                    FILTER(ALL('Calendar Table');
                        'Calendar Table'[date] <= MAX('Calendar Table'[date])))

Now you can use the following measure to cut the values off at the current month:

Cut off Forecast = 
VAR calc = FORMAT(YEAR(TODAY()) *100 + MONTH(TODAY()); "0000")
Return
IF(MAX('Calendar Table'[YearMonth]) <= calc; [Cumulative Forecast]; BLANK())