I have no idea what /opt/RMee/bin/wa ist but you could try '/usr/sbin/userdel k0013394966'. If that still does not work I'd simply remove the user by hand by removing it's line from /etc/passwd, /etc/shadow and deleting the home directory. Maybe also remove the user's additional groups from /etc/group.
Or are you using some directory service instead of files? In that case you might have to specify that with userdel. You can check for that with 'grep passwd /etc/nsswitch.conf'