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Getting the Last Month values returns wrong values



I was trying to get a list of the last month values for the Revenue Total column but for some reason the function stops working on the third entry. What could be causing this?



Thank you for your time,

Bernardo Macieira

Impactful Individual
Impactful Individual

hello @Anonymous 
im sure there is a better efficent way to do this but what i did is 

1) create a month-year column : 

Month-Year = FORMAT('Table'[Date],"MM-YYYY")

2) create a sort column : 
sort = FORMAT('Table'[Date],"YYYYMM")
3) create a rank for the dates : 
RANK = RANKX('Table','Table'[sort],,ASC,dENSE)
4) create a measure: 
Last Month sales = CALCULATE(SUM('Table'[Sales]),FILTER(all('Table'),'Table'[RANK]= (MAX('Table'[RANK])-1)))

i made a very small sample unrelated to your data:





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