Matter Opening Eröffnung des Verfahrens Matter Opening Apertura de asunto Apertura de asunto Ouverture de l'affaire פתיחת תיק मामला खोलना 事件開始 Abertura do processo 案件开启 From the buyer's (e.g., client's) prospective, the date at which the client (e.g., corporation) identifies a particular legal matter.