Check that the reference input by user is not already defined in acl-users folders

bt5/erp5_configurator/SkinTemplateItem/portal_skins/erp5_configurator/BusinessConfiguration_validateCustomerUsername.xml

@@ -60,6 +60,11 @@ for reference in reference_list:\n
 portal = context.getPortalObject()\n
 reference = editor\n
 \n
+# check this is a not a reference from acl_user\n
+if portal.acl_users.getUserById(reference) is not None or  \\\n
+  portal.aq_parent.acl_users.getUserById(reference) is not None:\n
+    return 0\n
+\n
 # ... then check already created accounts\n
 if portal.portal_catalog.getResultValue(\n
       reference = reference, \n

bt5/erp5_configurator/bt/revision

-547
\ No newline at end of file
+548
\ No newline at end of file