Foreman » Smart Proxy

I have a subnet definition
subnet 10.253.2.0 netmask 255.255.255.0 {
stuff
}

If I add a host definition to the subnet like

subnet 10.253.2.0 netmask 255.255.255.0 {
stuff
host puter {
       server-name "puter";
       hardware ethernet 00:18:dd:01:9e:2e;
       fixed-address 10.253.2.127;
       }

}

the subnet does not get recoginzed.
If I add in the subnet stanza something like

     class "pxeclients" {
          match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
          if option pxe-system-type = 00:02 {
                  filename "ia64/elilo.efi";
          } else if option pxe-system-type = 00:06 {
                  filename "grub/grub-x86.efi";
          } else if option pxe-system-type = 00:07 {
                  filename "grub/grub-x86_64.efi";
          } else {
                  filename "pxelinux.0";
          }
     }

the same thing happens.
If I extract the static hosts into dhcpd.hosts and include it then things are ok.