In the Global Settings, you can configure the Trade Copier Status to ON or OFF, which will define if the copy trading is currently active or not. While the Trade Copier Mode will allow you to choose to copy all trades, or copy only trades that are in open position (Open Only) or close a position (Close Only). In such a case, you could receive a Deleted: Trade Copier is OFF/OpenOnly/CloseOnly Mode order status if your master tries to place an order and you have either one of the settings enabled/disabled.
Learn more about Global Settings.