DAX Measure SAMEPERIODLASTYEAR

Hi,

I've got a simple dataset that has a main data table (composite) and a dynamic dates table, which has a many to one relationship.

I'm trying to build two measures for the same KPI, one for current and year and other for last year.

My two measures are returning the same result though and I cannot see why :( what am I missing?

Absorption CY:
Aftersales Absorption CY =
var CurrentYear = YEAR(TODAY())
var Absorption =
DIVIDE(
SUM(Composite[Service Direct Profit]) + SUM(Composite[Parts Direct Profit]),
SUM(Composite[Total Overheads]))
var AbsorptionCY = CALCULATE(Absorption, Dates[Year] = CurrentYear)
return
AbsorptionCY

Absorption PY:
Aftersales Absorption PY =
VAR Absorption =
DIVIDE (
SUM(Composite[Service Direct Profit]) + SUM(Composite[Parts Direct Profit]),
SUM(Composite[Total Overheads])
)
VAR AbsorptionPY =
CALCULATE (Absorption, SAMEPERIODLASTYEAR(Dates[Date]))
RETURN
AbsorptionPY

Also, I'll use SUMX once I've worked out whats going wrong here.