can disable a service from an extra

src/rougail/path.py

@@ -174,6 +174,7 @@ class Path:
                                           )
         namespace = dico['variableobj'].namespace
         if namespace not in [self.variable_namespace, 'services'] and \
+                current_namespace != 'services' and \
                 current_namespace != namespace:
             msg = _(f'A variable located in the "{namespace}" namespace shall not be used '
                     f'in the "{current_namespace}" namespace')