Udev displays messages on boot regarding unknown keys

Issue

• After configuring some custom udev rules and rebooting the server, it displays some error messages:

udevd[624]: add_to_rules: unknown key 'SUBSYSTEMS'
udevd[624]: add_to_rules: unknown key 'ATTRS{vendor}'
udevd[624]: add_to_rules: unknown key 'ATTRS{model}'
udevd[624]: add_to_rules: unknown key 'SUBSYSTEMS'
udevd[624]: add_to_rules: unknown key 'ATTRS{vendor}'
udevd[624]: add_to_rules: unknown key 'ATTRS{model}'

• In RHEL 7 systemd-udevd prints errors regarding the 70-persistent-net.rules file and interfaces are not renamed as expected:

systemd-udevd: unknown key 'UBSYSTEM' in /etc/udev/rules.d/70-persistent-net.rules:1
systemd-udevd: invalid rule '/etc/udev/rules.d/70-persistent-net.rules:1'

• Do these messages affect how udev functions?
• How can I get rid of these?