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User Object is not Showing in Master Detail Relationship

i have a custom object . one field i want to make as master-detail with User object such that when user is deleted .Object is also deleted.but when i try to make the master-detail relationship .it is not showing User Object.can any one please tell why and how to resolve it ??




As per design a user can not be deleted, a user can only be deactivated. Cascade-delete and its related options are not available for user objects.


Refer: https://help.salesforce.com/HTViewHelpDoc?id=relationships_considerations.htm&language=en_US