This should be easy and I am sure I have done similar before.
However, I have tried numerous variations and all fail.
Note the yellow fields on the right.
CHange the Qty from 1 to 2.
This will double the "Line Value" field (correct so far).
However, the "Net Total" lower down is NOT refreshed.
(It IS correct if you exit the form and re-enter. Underlying calculations are fine)
Question: How do I get this field to Refresh?