Link Sales lines to Sales Header

I'm tryinig to create a sales dasboard. Therefor I need the sales invoice header for some information but also the sales invoice lines. A invoice header has always more lines below it.

I have build a small part of the complete dashboard in the Tableuilder and it provides very quickly the information. However I would like to build this report with the Browser because than it's easier to add some columns.

I Used exactly the same formula with the browser ( that's what I think what I did) but than it doesn't work.

Can someone help me with fixing this issue and tell what I need to do?


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