I have already calculated the item-line price including VAT (quantity * price * vat) using the calculated field attribute type.
Know I want to calculate the total sum of all invoice rows belonging to 1 invoice.
I see the row-counts example and also the selector for linked-fields and sum/count/min/max chooser.
But somehow the grid does not show that sum. What is the right way?
Perhaps add those calculations also in the CRM template so people can learn from it?