Extensible select and enumeration types

and their elements in schema CHANGE_MANAGEMENT_MIM taking into account BASED_ON types


 approval_item - EXTENSIBLE GENERIC_ENTITY SELECT
          frozen_assignment

 change_management_object - EXTENSIBLE GENERIC_ENTITY SELECT

 change_relationship_select - EXTENSIBLE GENERIC_ENTITY SELECT
          product_definition_formation_relationship

 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 date_and_time_item - EXTENSIBLE SELECT
          approval_person_organization

 date_item - EXTENSIBLE SELECT
          approval_person_organization