Measure based on drill down level

Hi community! 

I created a measure of the total value of importations and put it in a column chart by date. I can drill down this chart to show the measure by year, quarter or month. Until this point is ok. 

In the same chart I added a red line to show Month over Month variation measure. 

My issue consists in that: I would like this measure changes dinamically when I drill down or drill up the hierarchy. 

Example: if I drill up the chart to Years level, the lyne would change to Year over Year variation measure. 

I have tried to create a measure to identify the level of drill down using ISINSCOPE DAX as follow: 

But even if I drill up the chart to Year level, the DAX function always returns false. 

Does someone knows what I am doing wrong?