First target from cumulative total

Need to help to find the first target from cumulative total.

and then highlight the months to achieve target

Lets set Target as 15

Measures:

"Pts Run" is a cumulative total

"Pts Tgt" = MIN (Pts Run,15)

Expected out put 

For id 1, it's acheived on April, Flag value is "Y" till April, remaining months to be marked as "N"

For id 2, it's acheived on March,Flag value is "Y" till March, remaining months to be marked as "N"

Unable to upload the sample pbix file. Pls find the details

Sample Data:

Table Name: Sample

Calendar table

Calendar = CALENDAR(MIN('Sample'[dt]),MAX('Sample'[dt]))

 

Measures:

 

Pts = SUM('Sample'[pts])

Pts Run = CALCULATE([Pts], ALLSELECTED('Calendar'[Date]),'Calendar'[Date]<=MAX('Calendar'[Date]))

Pts Tgt = MIN([Pts Run],15)

Pts Flg = if([Pts Tgt]<=15,"Y","N")