If you changed the price, there will be a warning in the order that the price has changed.
In this order the prices for which the booking was made are displayed.
To compare the price to the present, click on Edit.
Then, click Save.
After saving in Calculated, a new price is displayed.
The warning has disappeared.
The Final displays the same price.
And a warning appeared on a blue background.
So you can compare prices.
You can also Update final invoice.
Then all warnings will disappear and the total amount will be calculated at the new prise options.