The Reminder For "Appointment Name" will not appear because the item is in a folder that doesn't support reminders. Is this OK?

We have created a public folder entitled SALES. This was created by logging into a workstation as an Administrator - Public Folders
- All Public Folders - New Folder Called SALES - Folder Contains Calendar Items. Add users permissions etc.

A user tried a test appointment today, tried to set a reminder and received the doesn't support message above.

Appears you are unable to do this by design on a public folder. Is there any way round it and are there any other options.

This is in SBS 2011 and Outlook 2013

Thanks in advance