Dynamic Date Filter in measure

Hi,

So I am working with a data set which has a the following dimensions: Table is called = 'Marvin Units'

Title,Transaction Year.Month,'Data (Units Sold)' and Release Year.Month)

I would like to create a dynamic measure which calculates the first 12 months 'Total Units' since it's release month and changes depending on the Title.

I have tried the following formula (2nd function) but have only been getting errors when putting the measure into a visual:


'Total Units' = CALCULATE(SUM('Marvin Units'[Data 'Units Sold']))

'First 12 months Total Units' = CALCULATE([Total Units],'Marvin Units'[Release Year.Month] <= CONCATENATE(LEFT(ALLSELECTED('Marvin Units'[Release Year.Month],4)+1,RIGHT(ALLSELECTED('Marvin Units'[Release Year.Month],2)))

Their are no errors when writing this formula however there is an error showing when placing into a visual.

An example of the desired result is:

Title '123' Release Year.Month = 2018.12
Title '123' = 1200 Total Units Sold
Title '123' = 700 Total Units Sold from 2018.12 to 2019.12

I hope my example and thought process is clear to understand.
Thanks in advance,

Akash