if invalid {
						return fmt.Errorf("%s is currently not supported with CUSTOM action", name)
					}
					return nil
				}
				for _, from := range rule.GetFrom() {
					if src := from.GetSource(); src != nil {
						errs = appendErrors(errs, check(len(src.Namespaces) != 0, "From.Namespaces"))
						errs = appendErrors(errs, check(len(src.NotNamespaces) != 0, "From.NotNamespaces"))