When exchanging a candidate for a booking why do I see a “Booking not updated” message?

If you are trying to exchange a specific candidate/worker for a booking in the Booking Plan, but when you click on Exchange button, you see a message saying “Booking not updated“, this means that you have not selected any Dates to Change Candidate for.

In CentricFlow, you cannot exchange the candidate booking if you don’t select at least one booking placement date.