Post.Only in the TSLab program is supported only with limit orders.
With conditional orders and orders "by market" does not work!
Examples for the visual editor:
"Opening and Closing Position Limit Price"
"Position opening if more / less" with the corresponding flag Opening with limit orders in the Agent’s Trading Settings.
"Closing a take-profit position" with a flag in the trading settings "Take-profit without slipping"
"Change By limit and take-profit"
Those. the type of the submitted order can only be limited, for the Post.Only to work in the TSLab program.