noun, noun or participle which takes 'suru', transitive verb
change of post; role change
Refers to a reassignment or rotation of duties, often in an organizational or theatrical context.
来月、部署の役替えがあるらしい。
Apparently there will be a change of posts in the department next month.
歌舞伎では、役者が役替え
In kabuki, actors sometimes switch roles.