This is a confusing one… but the ARForm (Report style) uses the ARInvoice (RDD).
Look at the stock ARForm report style…
It’s calling the ARInvoice RDD…
Did you make a copy and edit the correct RDD?
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Also, your linked field may not be part of the T1. table you need to tie to appropriate table?
Copy and paste the dataset query into a proper text editor, and make sure every new line starts with a space, then try it again…
Can you show us the detail tab of the RDD you are using we need to see the ID. That should match with the RDD id in the report style.