What if parameter don't flows to table

I created a What IF parameter to classify products categories between High Profit and Low Profit.

Everything works, but what doesn't work is that I wanted the margin value to change dinamically, so in the grouping table I included the parameter measure instead of a fix number. 

But, it won't change when I select a new parameter in the slicer, it keeps showing the default value (0.15)

What am I missing?

Thanks