Changes to Retrieve an inventory unit

added the new external_id_in_use enum value to the code response property for the response status 400

added the new external_id_in_use enum value to the code response property for the response status 401

added the new external_id_in_use enum value to the code response property for the response status 403

added the new external_id_in_use enum value to the code response property for the response status 404

added the new external_id_in_use enum value to the code response property for the response status 429

added the new external_id_in_use enum value to the code response property for the response status 500

added the new requires_ekho_review enum value to the code response property for the response status 400

added the new requires_ekho_review enum value to the code response property for the response status 401

added the new requires_ekho_review enum value to the code response property for the response status 403

added the new requires_ekho_review enum value to the code response property for the response status 404

added the new requires_ekho_review enum value to the code response property for the response status 429

added the new requires_ekho_review enum value to the code response property for the response status 500

added the new resource_not_writable enum value to the code response property for the response status 400

added the new resource_not_writable enum value to the code response property for the response status 401

added the new resource_not_writable enum value to the code response property for the response status 403

added the new resource_not_writable enum value to the code response property for the response status 404

added the new resource_not_writable enum value to the code response property for the response status 429

added the new resource_not_writable enum value to the code response property for the response status 500

added the required property data/pricing to the response with the 200 status

endpoint added