Customizing the metamodel : Keywords for USRPROPS : FROM_CHOICES_ONLY
  
FROM_CHOICES_ONLY
Restricts a user to only select a definition from a choices list, without being able to type in a new definition. A message box appears prompting a user to select only from the "Choices" list. This is used with LISTOF and ONEOF.
Example
DEFINITION "Product"
{
CHAPTER "Technical Reference Model"
PROPERTY "Status" {Zoomable EDIT Oneof "Product Status"}
Group "Involvements"{
LAYOUT { COLS 2 ALIGN OVER }
PROPERTY "Lead Proponent" {Zoomable EDIT Oneof "Organizational Unit" FROM_CHOICES_ONLY}
PROPERTY "Others Involved" {Zoomable EDIT Listof "Organizational Unit" FROM_CHOICES_ONLY}
}
}