/**
  * sets the last number by a given record, if the number has been manually set
  * 
  * @param Tinebase_Record_Interface $record
  */
 protected function _setLastNumber($record)
 {
     $numberBackend = new Sales_Backend_Number();
     $number = $numberBackend->getCurrent($this->_modelName);
     $this->_removePrefix($record);
     if (intval($record->{$this->_numberProperty}) > $number) {
         $numberBackend->setCurrent($this->_modelName, $record->{$this->_numberProperty});
     }
     $this->_formatNumber($record);
 }