public function getSubtableDimension()
    {
        if (empty($this->actionToLoadSubTables)) {
            return null;
        }

        list($subtableReportModule, $subtableReportAction) = $this->getSubtableApiMethod();

        $subtableReport = ReportsProvider::factory($subtableReportModule, $subtableReportAction);
        if (empty($subtableReport)) {
            return null;
        }

        return $subtableReport->getDimension();
    }