diff --git a/patches.d/scribe-backend.patch b/patches.d/scribe-backend.patch
index 863d8d6..5ab8a2c 100644
--- a/patches.d/scribe-backend.patch
+++ b/patches.d/scribe-backend.patch
@@ -72,7 +72,7 @@ index 0db4982..290d66e 100755
          nscd_start()
          log.del_lock()
 diff --git usr/lib/python3/dist-packages/scribe/eoleldap.py usr/lib/python3/dist-packages/scribe/eoleldap.py
-index 45ec338..9b80f82 100644
+index 45ec338..dd819eb 100644
 --- usr/lib/python3/dist-packages/scribe/eoleldap.py
 +++ usr/lib/python3/dist-packages/scribe/eoleldap.py
 @@ -8,21 +8,21 @@
@@ -98,7 +98,7 @@ index 45ec338..9b80f82 100644
  def is_system_user(user):
      """
          indique si le login proposé est déjà un utilisateur système
-@@ -120,60 +120,68 @@ class _Ldap(object):
+@@ -120,75 +120,83 @@ class _Ldap(object):
  class _LdapEntry(object):
      """
          classe de base pour gérer les entrées ldap
@@ -169,15 +169,62 @@ index 45ec338..9b80f82 100644
              return False
          return True
  
-     def _test_available_name(self, name):
+-    def _test_available_name(self, name):
++    def _test_available_name(self, name, etab=None):
          """
              Test la disponibilité d'un nom
              raise une exception si pas disponible
          """
+-        if self._is_group(name):
++        if self._is_group(name, etab=etab):
+             raise LdapExistingGroup
+-        elif self._is_user(name):
++        elif self._is_user(name, etab=etab):
+             raise LdapExistingUser
+-        elif is_system_user(name):
++        elif is_system_user(name, etab=etab):
+             raise SystemExistingUser
+         return True
+ 
+     def get_niveau(self, classe):
+         """
+             Retourne le niveau associé à la classe
+         """
+         self.ldap_admin.connect()
+         res = self._get_niveau(classe)
+         self.ldap_admin.close()
 diff --git usr/lib/python3/dist-packages/scribe/eoleuser.py usr/lib/python3/dist-packages/scribe/eoleuser.py
-index 05569fd..7a8d46c 100644
+index 05569fd..b4a4fb8 100644
 --- usr/lib/python3/dist-packages/scribe/eoleuser.py
 +++ usr/lib/python3/dist-packages/scribe/eoleuser.py
+@@ -259,26 +259,26 @@ class User(LdapEntry):
+             Ajoute un utilisateur
+             **args
+         """
+         self.filter_must_args(args)
+         self.filter_may_args(args)
+         #force login in lower case #33178
+         login = args['login'].lower()
+         args['login'] = login
+         if match("^[a-zA-Z0-9.\-_]*$", login) is None:
+             raise BadLogin("Login \"%s\" invalide !" % login)
+-        self._test_available_name(login)
+         args.setdefault('etab', None)
+         if args['etab'] is None and 'classe' in args:
+             args['etab'] = self.get_etab_from_group(args['classe'])
+         if args['etab'] == num_etab:
+             args['etab'] = None
++        self._test_available_name(login, etab=args['etab'])
+         self.cache_etab['login'][login] = args['etab']
+         # FIXME : fixes #327 mais est-ce le bon endroit ?
+         if tool.not_empty(args, 'date'):
+             args['date'] = tool.deformate_date(args['date'])
+         if 'exp_date' in args:  # Can be jj/mm/aaaa or empty string
+             if LDAP_MODE == 'openldap':
+                 args['exp_unix_days'] = str(tool.get_days_from_epoch(args['exp_date'])) if args['exp_date'] else '-1'
+             else:
+                 args['exp_nt_time'] = str(tool.get_nt_time_from_date(args['exp_date'])) if args['exp_date'] else '0'
+             args.pop('exp_date')
 @@ -536,31 +536,32 @@ class User(LdapEntry):
          data = [((MOD_REPLACE, attribut, value))]
          self.ldap_admin._modify(user_dn, data)