Adapter/ShopwareAdapter/DataPersister/Attribute/AttributeDataPersister.php
private function getAttributeKey(Attribute $attribute)
    {
        $key = iconv('UTF-8', 'ASCII//TRANSLIT', $attribute->getKey());

        $attribute_key = strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($key)));

        return $this->prefix . $attribute_key;
    }
private function getAttributeKey(Attribute $attribute)
    {
        $key = iconv('UTF-8', 'ASCII//TRANSLIT', $attribute->getKey());

        $attribute_key = strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($key)));

        return $this->prefix . $attribute_key;
    }
@param Attribute $attribute

@return string