private function computeRealCost(Pap_Contexts_Action $context, $valueIN, $paramName) {
        if($context->getActionType() != Pap_Common_Constants::TYPE_ACTION) {
        	$context->debug('RealCost is 0 as the transaction type is not sale/action but '.$context->getActionType());
            return 0;
        }
        $valueOriginal = $valueIN;
        $value = $this->normalizeValue($valueOriginal);

        if($valueOriginal != $value) {
            $context->debug("        $paramName value from parameter is '".$valueOriginal."', corrected to '".$value."'");
        } else {
            $context->debug("        $paramName value from parameter is '".$value."'");
        }
        if($value == ''){
            return 0;
        }
        return $value;
    }