Untitled

add_filter('b2bking_discount_rule_regular_price', function($price, $product){
	$product_id = $product->get_id();
	$regprice = get_post_meta($product_id,'_regular_price', true);
	if (!empty($regprice)){
		$price = floatval($regprice);
	}
	
	return $price;
}, 10, 2);