Expression works in QV 12.10 but not in QV 12.40

[MBV]

Hey guys

We are using this expression in a pivot table to calculate the ytd value in QV 12.10:

Sum({$< Year={$(YTDYear)}, Month={'<=$(MaxBP)'} >}[Value])

The variables:
YTDYear= Year(Max(Date))
MaxBP=Max(Num(Month))

Why is it working in the older version but not in QV 12.40? 

The expressions seems to be ok but the result is always 0.

Thanks for your help

[Vegar · Accepted solution]

There has been some issues with set analysis and single/double quotes in some of the past releases. 

Try changing your single quotes to double. 

You could also take a look at these suppport cases: https://support.qlik.com/articles/000063567 and Quotes in Set Analysis with Dual Fields

[MBV]

Thank you so much!! It seems to work 😊

[tresesco]

With new QIX engine, thumb rule is - use single quotes for string matching and double quotes for searching.