/**
* check if db field can be null
* for multilingual fields it checks only the base fields as they may be
* coming from outer join views, so oxbase would return that they always
* support null (while in reality updates to their lang set table with null
* would fail)
*
* @param string $sFieldName db field name
*
* @return bool
*/
protected function _canFieldBeNull($sFieldName)
{
$sFieldName = preg_replace('/_\\d{1,2}$/', '', $sFieldName);
return parent::_canFieldBeNull($sFieldName);
}
