code: protected function normalizePropertyFormat()
      {
          if (empty($this->fields['PROPERTIES'])) {
              return;
          }
  
          foreach ($this->fields['PROPERTIES'] as $code => $prop) {
              $this->fields['PROPERTY_'.$code.'_VALUE'] = $prop['VALUE'];
              $this->fields['~PROPERTY_'.$code.'_VALUE'] = $prop['~VALUE'];
              $this->fields['PROPERTY_'.$code.'_DESCRIPTION'] = $prop['DESCRIPTION'];
              $this->fields['~PROPERTY_'.$code.'_DESCRIPTION'] = $prop['~DESCRIPTION'];
              $this->fields['PROPERTY_'.$code.'_VALUE_ID'] = $prop['PROPERTY_VALUE_ID'];
          }
      }
docs: Normalize properties's format converting it to 'PROPERTY_"CODE"_VALUE'.
  
  @return null