Secondary Tracking Segment is a Flex field qualified added in the 11.5.10 release. The secondary tracking segment is used in the revaluation, translation, and fiscal year-end close processes. The system will automatically maintain unrealized gain/loss, retained earnings, and cumulative translation adjustments by unique pairs of balancing segment and secondary tracking segment values. you can assign Secondary tracking segment flex field qualifier to an segment which haven’t assigned Natural account, balensing Segment and inter company.