Sum with a 'flexible' filter over a field

[jjremy]

Hello,

Maybe it is a basic question (since I found no post covering this), but my problem is the following.

Each month, we have some datalines with some income values for the different years.

So for there are 3 field:

* stand (which contains values like 23/12;24/01;...)

* ONGJR (it contains year, so 2023 or 2024)

* PREMIE (this one has information about the income)

So for each possible tuple (stand,ongjr), we have a couple of lines with the different incomes.

I want to make a graph that follows the evolution of the income.
If I write this:

Sum ({$<ONGJR ={2023}>} PREMIE)

I get a line that just follow the evolution of the income for the year 23.

Now, my ultimate goal is not to follow the income of 2023, but it would be that at 'stand' 23/12, I see the value of the year 2023, but at 'stand' 24/01, 24/02, ... I get the value for 2024.

My try was to replace 2023 by 2000+left(stand,2). This is indeed equal to 2023 for stand 23/12 and equal to 2024 for the stands starting with 24. (and it would work in 2025 too)
But somehow this doesn't work. I get the following error message:

So I guess something is missing in my formula, but I've tried a couple of things, nothing worked. Or maybe I should do it in another way?

Feel free to ask if you need some more information.

Thanks for your time and help, and have a nice day,

[Qrishna]

some dummy data to replicate your scenario plz?