diff --git a/gestion/gest_crans.py b/gestion/gest_crans.py
index 308f359a..7e95560f 100755
--- a/gestion/gest_crans.py
+++ b/gestion/gest_crans.py
@@ -2267,7 +2267,12 @@ def modif_adher(adher):
             if no: return modif_adher(adher)
             for m in adher.machines():
                 m.delete("Depart du campus")
-            adher.delete("Depart du campus")
+            try:
+                adher.delete("Depart du campus")
+            except EnvironmentError, c:
+                arg = u'--title "Destruction du compte" '
+                arg += u'--msgbox "%s\n\n\n" 0 0' % to_unicode(c.args[0])
+                dialog(arg)
             return
 
         else:
diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 697690eb..871e2501 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -4256,7 +4256,7 @@ class Facture(BaseClasseCrans):
     def delete(self, comment=''):
         """Suppression de la facture"""
         if self.controle():
-            raise EnvironmentError(u"La facture a déjà été controlée")
+            raise EnvironmentError(u"La facture a déjà été controlée, contacter trésorerie")
         self.__proprietaire = None
         self._delete(self.dn, comment)