Issue with amending a booking

Hi all,

I’m looking for some advice on the correct way to amend an existing Booking in Create, specifically when changing the Resource assigned to the booking.

I have a Booking Diary set up where the Resources are Mechanic technicians. Creating a new booking works as expected, and the available mechanics/resources are shown correctly.

However, I’m having an issue when amending an existing booking.

For example, I have an existing booking:

  • Resource: Mechanic 1
  • Date: 28/08/2026
  • Time: 10:30–11:25

When I open the booking and try to change the Resource from Mechanic 1 → Mechanic 2, Mechanic 2 does not always appear as an available Resource, even though I know Mechanic 2 is available at that time.

The same issue occurs if I try to change both the Resource and the date/time.

For example:

Existing booking:

Mechanic 1 – Monday 10:30

I want to amend it to:

Mechanic 2 – Monday 10:30

or:

Mechanic 2 – Tuesday 14:00

If Mechanic 2 is available according to their Resource/Shift Availability, I would expect them to be selectable, but currently this does not seem to work for me as expected.

I’ve also tried deleting the existing appointment first and then creating a new booking, but I get the same issue, the Resource I expect to be available still doesn’t appear.

I’ve looked at the available Rules, but the only relevant booking rule I can find is “Book the next available slot”, which doesn’t help because I need the back office user to choose the mechanic/resource and then choose the required date/time to amend the booking.

Thanks,

Amara