diff --git a/tiramisu/option/option.py b/tiramisu/option/option.py
index 619b2c0..90634ae 100644
--- a/tiramisu/option/option.py
+++ b/tiramisu/option/option.py
@@ -235,12 +235,9 @@ class IPOption(Option):
             return
         ip, network, netmask = vals
         if IP(ip) not in IP('{0}/{1}'.format(network, netmask)):
-            if warnings_only:
-                msg = _('should be in network {0}/{1} ({2}/{3})')
-            else:
-                msg = _('must be in network {0}/{1} ({2}/{3})')
+            msg = _('{4} is not in network {0}/{1} ({2}/{3})')
             return ValueError(msg.format(network, netmask,
-                              opts[1].impl_getname(), opts[2].impl_getname()))
+                              opts[1].impl_getname(), opts[2].impl_getname(), ip))
         # test if ip is not network/broadcast IP
         return opts[2]._cons_ip_netmask(current_opt, (opts[2], opts[0]), (netmask, ip), warnings_only)
 
@@ -437,8 +434,8 @@ class BroadcastOption(Option):
             return
         broadcast, network, netmask = vals
         if IP('{0}/{1}'.format(network, netmask)).broadcast() != IP(broadcast):
-            return ValueError(_('with network {0}/{1} ({2}/{3})').format(
-                network, netmask, opts[1].impl_getname(), opts[2].impl_getname()))
+            return ValueError(_('broadcast {4} invalid with network {0}/{1} ({2}/{3})').format(
+                network, netmask, opts[1].impl_getname(), opts[2].impl_getname(), broadcast))
 
 
 class DomainnameOption(Option):
@@ -524,7 +521,7 @@ class DomainnameOption(Option):
             except ValueError:
                 pass
             else:
-                raise ValueError(_('must not be an IP'))
+                return ValueError(_('must not be an IP'))
         part_name_length = self._get_len(self._get_extra('_dom_type'))
         if self._get_extra('_dom_type') == 'domainname':
             if not self._get_extra('_allow_without_dot') and not "." in value:
diff --git a/tiramisu/value.py b/tiramisu/value.py
index 8406071..a16beff 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -675,7 +675,7 @@ class Values(object):
                             if ret is not None:
                                 yield ret
 
-        descr = self._getcontext().cfgimpl_get_description()
+        descr = context.cfgimpl_get_description()
         for path in _mandatory_warnings(descr):
             yield path