public function convertToBase($amt, $fcrn_id, $date,$round = 6) {
        $source = $this->getSysCcmpCurrencySource($date);
        $rate = $this->getCurrencyRate($fcrn_id, $date,$source);
        if ($rate === FALSE) {
            return FALSE;
        }
        
        /**
         * @todo add convert type to fcsr_courrency_source as definition
         */
        if ($source == 2){
            return round($rate * $amt, $round);
        }
        return round($amt/$rate, $round);

        
    }