protected function createCombination(ConnectionInterface $con, ProductSaleElements $salesElement, $combinationAttributes)
    {
        foreach ($combinationAttributes as $attributeAvId) {
            $attributeAv = AttributeAvQuery::create()->findPk($attributeAvId);

            if ($attributeAv !== null) {
                $attributeCombination = new AttributeCombination();

                $attributeCombination
                    ->setAttributeAvId($attributeAvId)
                    ->setAttribute($attributeAv->getAttribute())
                    ->setProductSaleElements($salesElement)
                    ->save($con);
            }
        }
    }