The term_auto_assign pin parameter determines whether the pin's term_name value can be automatically changed. Before you run a terminator table, ensure that all the terminators you want to edit are eligible for modification, or whether all or some terminators are protected when this parameter is set to False. If the term_auto_assign parameter has never been set for a terminator, its value does not exist in the Electrical Parameters dialog box. You can update such a terminator.