You may not open positions under the below situations:
1. Available margin is not enough to open positions, cause we have the minimum amount requirements when open positions.
2. The order price is out of the range of price limits.
3. The amount exceeds the upper limit of single orders.
4. The number of positions exceed the upper limit for an individual investor.
5. Positions may only be closed within 10 min before settlement.
6. The positions are taken over by system.