Field Service Error for the user Resource on changing the booking status

I believe the field agent who would access the field service mobile app from the phone will be assigned the Field Service 'Resource' role. I schedule a booking for this resource. Then when I login to CRM web-client/mobile-client as a resource, I try to change the status of the booking to completed as excepted. While doing this I get this error : 

You do not have update permissions for the secured fields. If you contact support, please provide the technical details.

 When I try to change the booking status as a system administrator I am able to do so without any error.

As a resource will I not have the permission to complete my booking?

Any suggestion/ help on this would be highly appreciated.