Position Already Open

This message indicates that there is already an open position for the specified ticker. TradersPost requires that if you want to add to an open position, you must either check the Allow add to position checkbox in your strategy settings or use the action=add in your signal.

{
    "ticker": "AAPL",
    "action": "add",
    "quantity": 5
}

If you check Allow add to position, TradersPost will add to the existing position with action=buy or action=sell. If you do not check Allow add to position, the trade will be rejected when there is already an open position for the ticker.