Only add user if login does not exist yet

product/ERP5Configurator/Document/PersonConfiguratorItem.py

@@ -61,7 +61,11 @@ class PersonConfiguratorItem(XMLObject, ConfiguratorItemMixin):
                     , PropertySheet.Login)
 
   def _checkConsistency(self, fixit=False, filter=None, **kw):
-    error_list = ["Person %s should be created" % self.getReference(),]
+    error_list = []
+    person = self.portal_catalog.getResultValue(reference=self.getReference(),
+                                                portal_type="Person")
+    if person is None:
+      error_list.append("Person %s should be created" % self.getReference())
       if fixit:
         person_module = self.getPortalObject().person_module
         person = person_module.newContent(portal_type="Person")