private function getFieldChangeId(Tracker_FormElement_Field $field, $value)
 {
     if (isset($value['format']) && (string) $value['format'] === self::FORMAT_ID) {
         return $this->xml_fields_mapping->getNewOpenValueId((string) $value);
     }
     return $field->getFieldData((string) $value);
 }
 private function getFieldChangeId(Tracker_FormElement_Field $field, $value)
 {
     if (isset($value['format']) && (string) $value['format'] === self::FORMAT_ID) {
         return (string) $value;
     }
     return $field->getFieldData((string) $value);
 }