Issue with measures

Anonymous- Please check this out, let me know if this works. If this fix your problem, please tick this a solution and a thumps up.

Total Sales (Latest Year) = 
VAR CurrentYear = MAX('Sale'[Date].[Year])
RETURN
CALCULATE(
    SUM('Sale'[SalesAmount]), 
    FILTER('Sale', YEAR('Sale'[Date]) = CurrentYear)
)

I've hypothetically established this DAX measure, but without much clarity regarding your datasets. If this doesn't serve your needs, I recommend you share a sample dataset. This will give me a more comprehensive understanding of your data structure, enabling me to devise a more suitable solution.