Under what circumstances will the order fail when placing an order

(1) The contract is approaching the delivery month and it is not allowed to open positions.

(2) The minimum tick size does not meet the requirements.

(3) Wrong ways of placing an order:

For example:

a. Hong Kong Stock Exchange and LME products do not accept market orders.

b. Restrictions on stop-loss orders.

c. The order price and trigger price of the stop loss order are entered incorrectly.