MAT & MAT Prior has same value using SAMEPERIODLASTYEAR

PERMATA , You should use .[Date], Make sure date table is marked as date table

Try the second one like

MAT =

Var _date  =LASTDATE('Date'[Date])

var _dt = date(year(_date)-1, month(_date), Day(_date))

return

CALCULATE(
AVERAGE(data[value]),
DATESINPERIOD('Date'[Date],_date  ,-1,YEAR)
)

Why Time Intelligence Fails - Powerbi 5 Savior Steps for TI :https://youtu.be/OBf0rjpp5Hw
https://amitchandak.medium.com/power-bi-5-key-points-to-make-time-intelligence-successful-bd52912a5bd4
To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :radacad sqlbi My Video Series Appreciate your Kudos.

If this does not help
Can you share sample data and sample output in table format? Or a sample pbix after removing sensitive data.

Hi amitchandak , I found the MAT and MAT Prior show the same value when it aggregated (right side)

but show the correct figure when it show at month/year level (left side)

how to make the formula also work for aggregated (left side)?

Thank you 🙂