Extensible select and enumeration types

and their elements in schema Extended_task_element_arm taking into account BASED_ON types


 activity_method_item - EXTENSIBLE GENERIC_ENTITY SELECT

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Condition
          Condition_assignment
          Condition_parameter
          Condition_relationship

 condition_item - EXTENSIBLE GENERIC_ENTITY SELECT

 condition_parameter_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Condition_relationship