A value shared across entities

Question

Hello,

• "System object" is a table & its key is auto increament
• "Security entity" view that get id get Id from "System object"
• "User" is a table has a many-to-many relation with "System Object"
• "Role" is a view

In the model:

• Security Entity ..... inharits from System object
• user ..... inharits from Security entity
• Role ..... inharits from Security Entity

when I create new User OR new role (Using my context) It raises this exception:

A value shared across entities or associations is generated in more than one location