Règle correspondante
Practice Relating to Rule 67. Inviolability of Parlementaires
The Report on the Practice of China recalls the occasion during the Chinese civil war when the Chairman of the Chinese Communist Party met the leader of the Nationalist government in Chongqing (the Nationalist capital) to negotiate a truce and a settlement to the conflict. The negotiations were unsuccessful, but the Communist delegation’s safety was guaranteed. 
Report on the Practice of China, 1997, Chapter 2.2.