Rally - WSAPI: Why doesn't a ProjectPermission have an ObjectID?

Document ID : KB000130841
Last Modified Date : 12/04/2019
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Introduction:
Most endpoints in WSAPI will return objects that include a variety of attributes that contain unique data such as CreationDate, ObjectID, and ObjectUUID.  Objects from the ProjectPermission endpoint, however, contain none of those. 
Question:
Why doesn't the ProjectPermission endpoint include attributes that can uniquely identify each ProjectPermission?
Answer:
The ProjectPermission endpoint is comprised of data from two tables using a database view.  Therefore the results being returned by the ProjectPermission endpoint do not exist as data in a singular table and they do not have any uniquely identifying information.

While not a complete replacement for an ObjectID, the CustomObjectID field forms a primary key since it is comprised of the User's object ID, the project's object ID and the permission for that project.  The breakdown of the CustomObjectID is as follows:
 213628258u 29460514p 1
|__________|_________|_|
UserID      ProjectID Permission