The parsing of /etc/os-release (new in 3.12.0) results in the sles and
sles<version>_ hard classes. The suse and suse<version>_ are only available on SLES 12 SP 3 or lower because they still have /etc/SuSE-release. /etc/SuSE-release was removed in SLES 15.
To maintain backward compatibility Any place the MPF references suse, it should also reference sles.