One of the objects cannot exist without being related to only one of another object.
For example, Menu items on menus: SPFMenuItems
Use cases
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The menu item must always be related to a menu.
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The menu item can only be related to one menu.
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When the menu is deleted, the menu items must be deleted.
Relationship configuration
Required - Min1=1
Only one - Max1=1
Menu items must be deleted - Delete_12=True
No ownership