BasketItemBase::onBeforeSetFields

protected function onBeforeSetFields(array $values)
{
	$priorityFields = [
		'CURRENCY', 'CUSTOM_PRICE', 'VAT_RATE', 'VAT_INCLUDED',
		'PRODUCT_PROVIDER_CLASS', 'SUBSCRIBE', 'TYPE', 'LID', 'FUSER_ID'
	];

	$priorityValues = [];
	foreach ($priorityFields as $field)
	{
		if (isset($values[$field]))
		{
			$priorityValues[$field] = $values[$field];
		}
	}

	return $priorityValues + $values;
}