Kickstart with spacewalk

[Jérôme Meyer]

Hello All,

I'm using the spacewalk GUI to produce the kickstart file. Unfortunately the SNIPPET variable could not be evalued and replaced.
An "unknown command" appears during the boot startup. Here's the kickstart file retrieve from URL or from shell :
-URL: http://spacewalk/cblr/svc/op/ks/profile/ks_profile_centos7_dev:1:SpacewalkDefaultOrganization
-shell: /var/lib/rhn/kickstarts/wizard/ks_profile_centos7_dev--1.cfg

[...]
Kickstart config file generated by Spacewalk Config Management
Profile Label : ks_profile_centos7_dev
Date Created : Wed Jul 18 07:58:56 CEST 2018
install
text
network --bootproto dhcp
url --url http://spacewalk/ks/dist/org/1/ks_distrib_centos7
lang en_US.UTF-8
keyboard ch
[...]
$SNIPPET('spacewalk/1/part_'+$server_type)
[...]

This variable was ok in the past before the upgrade to 2.8.
Has anyone encounter this issue?
How could I troubleshoot such an error?

Best regards, J.
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