tyr: send error 409 while deleting billing_plan used in user
tyr: send error 409 while deleting billing_plan used in user

CanalTP/navitia,CanalTP/navitia,pbougue/navitia,kinnou02/navitia,Tisseo/navitia,pbougue/navitia,patochectp/navitia,kadhikari/navitia,patochectp/navitia,xlqian/navitia,xlqian/navitia,antoine-de/navitia,Tisseo/navitia,kinnou02/navitia,kadhikari/navitia,Tisseo/navitia,kinnou02/navitia,antoine-de/navitia,patochectp/navitia,kinnou02/navitia,antoine-de/navitia,kadhikari/navitia,CanalTP/navitia,xlqian/navitia,Tisseo/navitia,pbougue/navitia,xlqian/navitia,antoine-de/navitia,CanalTP/navitia,CanalTP/navitia,kadhikari/navitia,xlqian/navitia,patochectp/navitia,Tisseo/navitia,pbougue/navitia