Editing Scheduled Appointments in CRM for Phones/Tablets

Here's what's happening:

1. Create an Appointment in Outlook.
2. Set Regarding to a CRM Account.
3. Wait for the Appointment to sync to CRM.

Then, when I look up the Appointment in one of the mobile apps, all the fields are locked. However I can edit in the web app.

• There is no JavaScript on this entity.
• There are no Business Rules on this entity.
• There are no custom plugins on this entity.
• The Status of the Appointment is Scheduled.
• This does not happen to other Activities such as Tasks.

CRM 2015 Online, Update 1.

Example from the Windows 8 app:

Thanks in advance!