The maximum propagation here can be understood as the maximum amplitude. Because you open the interface, choose the operation direction, and prepare to place an order until it is finally submitted to the market. Maybe the instantaneous quotation of the market has changed. There are many reasons for the change, such as the network situation or the sudden strengthening of the market trend.

The 50-point spread provided by default here is silver amplitude 50 yuan/kg; Gold fluctuated by 0.05 yuan/gram. That is, the difference between the transaction price you provided and the market quotation. If it is greater than the difference, the list cannot be submitted successfully.