Hi!
I want to sum all positions and group them by their respective invoice number.
However, I cannot make the computation work.
In the documentation I only found a hint that filer don’t work with “parallel iterations”. Am I doing a parallel iteration here? Is there a solution for this?
My Data Model (A12 2023-06-ext3):
domainModel.json (4.5 KB)
Thanks,
Tobias
PS: This is a simplified example. My real life example is more complex and has additional restrictions on how to model my groups and fields. 
It seems the $-Operator does the trick. I’ve never come across that before and the documentation is really hard to understand. Is there a online training or do we have some good examples somewhere?
Hi @tobias-amber-boulder
I’m glad you were able to find the correct part of the documentation and a solution for your problem.
There’s a Kernel Language Tutorial available in the Documentation. It starts off slow but by step 3 you are using Filter Operators and the $ Operator (Step 3c). There’s an expandable area after each rule to explain what’s happening in detail.
I hope that helps 
