Use product custom field in price calculation

if(($product->marcaje)=="A"){

}

if(!empty($product->tecnica)){...}

function hikashop_product_price_for_quantity_in_cart(&$product){
	$currencyClass = hikashop_get('class.currency');
	$quantity = @$product->cart_product_quantity;
	if(empty($product->prices)){
		$price= null;
		$price->price_currency_id = hikashop_getCurrency();
		$price->price_min_quantity = 1;
		$product->prices = array($price);
	}
	if(!empty($product->test)) {
		foreach($product->prices as $k => $price){
			$product->prices[$k]->price_value == 100;
			$product->prices[$k]->price_value_with_tax == 118;
		}
	}
	$currencyClass->quantityPrices($product->prices,$quantity,$product->cart_product_total_quantity);