How can I see the original price that was at the moment of specific reservation, if the prices for the services has been changed since that time?

If you changed the price, there will be a warning that the price has changed. It will be displayed on the Calculated tab in the order details.
An order displays the prices at which the reservation was initially made.
To compare the price with the real one, click in the reservation area.
And then on the reservation form, click Save.
After saving, the new price is displayed in the Calculated tab. The warning disappeared.
The Final tab shows the previous price. And now there is a warning with a blue line.
The order amount will not change in this case.
This way you can compare prices.
You can also Update final invoice on the Calculated tab.
Then all warnings will disappear and the total amount will be calculated according to the new prices.
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