dynamic parameters and names

Hi antonio_wurth 
This happens because your parameters are based on today and not on selected years.
So no matter what you choose, the parameter will be the year of today or previous to today.
As an alternative, you can use a disconnected years table and dynamic measure.

Dynamic_sales = if(ISFILTERED('dim_date'[calendar_year]),

 if(SELECTEDVALUE('Years'[Years])=max('dim_date'[calendar_year]),[sales_ytd],

if(SELECTEDVALUE('Years'[Years])=max('dim_date'[calendar_year])-1,[sales_ytd_py])),"")

Or just use The years of your date table as a legend with 1 measure

pbix is attached

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