Strange update... How to investigate?

In my test system, samba is required by vpn:

[root@nscom ~]# rpm -e --test samba
error: Failed dependencies:
	samba < 4.0.0 is needed by (installed) nethserver-samba-1.5.4-1.ns6.noarch
[root@nscom ~]# rpm -e --test nethserver-samba
error: Failed dependencies:
	nethserver-samba is needed by (installed) nethserver-ipsec-1.1.3-1.2.g249f62e.ns6.noarch