Airport: EDDM TCV6281 on the picture flies north. The first landing command was L 8R but when a plane would take off on 8R I have issued a new L command. Regularly the plane changes runway without any problem. In this case the plane began to fly towards the 8L and the response message was cleared to intercept runway. After that the plane accepted a C command to fly towards a waypoint: DM035. It was the last C command what it accepted. S commands works but nothing else. I think there is a distance where the plane can change runway, but within that it wouldn't accept the change command.