// dict can't handle unique constraints?
DBDictionary dict = repos.getDBDictionary();
if (_unq != null && !dict.supportsUniqueConstraints) {
Log log = repos.getLog();
if (log.isWarnEnabled())
log.warn(_loc.get(prefix + "-unique-support", context));
return null;
}
boolean fill = repos.getMappingDefaults().defaultMissingInfo();
if (!adapt && !fill && _unq == null)