CCrmProductRowRestProxy::innerGetList

protected function innerGetList($order, $filter, $select, $navigation, &$errors)
{
	$ownerID = $filter['OWNER_ID'] ?? 0;
	$ownerType = $filter['OWNER_TYPE'] ?? '';
	$ownerTypeName = CCrmProductRow::ResolveOwnerTypeName($ownerType);
	$ownerTypeID = CCrmOwnerType::ResolveID($ownerTypeName);

	if($ownerID <= 0 || $ownerType === '')
	{
		if ($ownerID <= 0)
		{
			$errors[] = 'The field OWNER_ID is required in filer.';
		}

		if ($ownerType === '')
		{
			$errors[] = 'The field OWNER_TYPE is required in filer.';
		}
		return false;
	}

	if($ownerType === 'I')
	{
		//Crutch for Invoices
		if(!CCrmInvoice::CheckReadPermission($ownerID))
		{
			$errors[] = 'Access denied.';
			return false;
		}

		$result = array();
		$productRows = CCrmInvoice::GetProductRows($ownerID);
		foreach($productRows as $productRow)
		{
			$price = isset($productRow['PRICE']) ? round((double)$productRow['PRICE'], 2) : 0.0;
			$discountSum = isset($productRow['DISCOUNT_PRICE']) ?
				round((double)$productRow['DISCOUNT_PRICE'], 2) : 0.0;
			$vatRate = isset($productRow['VAT_RATE']) ? (double)$productRow['VAT_RATE'] * 100 : 0.0;
			$taxRate = isset($productRow['VAT_RATE']) ? round((double)$productRow['VAT_RATE'] * 100, 2) : 0.0;

			if(isset($productRow['VAT_INCLUDED']) && $productRow['VAT_INCLUDED'] === 'N')
			{
				$exclusivePrice = $price;
				$price = round(CCrmProductRow::CalculateInclusivePrice($exclusivePrice, $vatRate), 2);
			}
			else
			{
				$exclusivePrice = round(CCrmProductRow::CalculateExclusivePrice($price, $vatRate), 2);
			}
			unset($vatRate);

			$discountRate = \Bitrix\Crm\Discount::calculateDiscountRate(($exclusivePrice + $discountSum), $exclusivePrice);

			$result[] = array(
				'ID' => $productRow['ID'],
				'OWNER_ID' => $productRow['ORDER_ID'],
				'OWNER_TYPE' => 'I',
				'PRODUCT_ID' => $productRow['PRODUCT_ID'] ?? 0,
				'PRODUCT_NAME' => $productRow['PRODUCT_NAME'] ?? '',
				'PRICE' => $price,
				'QUANTITY' => $productRow['QUANTITY'] ?? 0,
				'DISCOUNT_TYPE_ID' => \Bitrix\Crm\Discount::MONETARY,
				'DISCOUNT_RATE' => $discountRate,
				'DISCOUNT_SUM' => $discountSum,
				'TAX_RATE' => $taxRate,
				'TAX_INCLUDED' => $productRow['VAT_INCLUDED'] ?? 'N',
				'MEASURE_CODE' => $productRow['MEASURE_CODE'] ?? '',
				'MEASURE_NAME' => $productRow['MEASURE_NAME'] ?? '',
				'CUSTOMIZED' => $productRow['CUSTOM_PRICE'] ?? 'N',
			);
		}
		return $result;
	}

	if(!EntityAuthorization::checkReadPermission($ownerTypeID, $ownerID))
	{
		$errors[] = 'Access denied.';
		return false;
	}

	return CCrmProductRow::GetList(
		$order, $filter, false, $navigation, $select,
		array('IS_EXTERNAL_CONTEXT' => true, 'EXTENDED_FIELDS' => true)
	);
}