Core TSIs : Reservations : Reservations - Field Descriptions : Attendees fields
Attendees fields
Field
Description
Code
Enter a code to uniquely identify the attendee.
Is required?
Select Yes if the attend is required in the reservation/meeting created.
Order
If you have navigated from a reservation, this field will be automatically filled with the order details.
System status
Displays the status of the attendee.
System code
Displays the system code of the business object.
Email address
Displays the email address of the attendee.
* 
An attendee must be unique for a reservation. This means that the value of the fields Email address and Person (or Visitor) must be unique for an attendee of a reservation.
Person
Select the person name if the attendee is an internal employee.
Visitor
Select the name of the visitor (external or internal).
* 
You can either select the Person field or Visitor field, but not both.