Adjust the price onscreen; why is a discount forced on the invoice?

SUGGESTED

Hi,

SAGE 50 2020 Quantum. 5 users.

I make and preview an invoice (not posted).

Whoops! The price on the first one should have been $5, not $20. So, I go back to the screen and change the price of the first line to $5 each.

I would expect the preview to show 5 units x $5/unit = 25. However, it shows a Discount. Why is that? The numbers add up but it looks stupid.

The only solution I know of is to delete the entire row. Then re-enter the entire row. What a waste of time.