OCA orders cannot be added to working orders in Classic TWS or Mosaic. The working order would need to be cancelled and a new order created with OCA identifiers added prior to transmitting.
How do I add an One Cancels All (OCA) order to a working order in TWS or Mosaic?
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How do I create a One Cancels Another (OCA) group of orders in IBKR Mobile?
How do I create a bracket order (OCA) for an existing position in Mosaic?
How can I delete an order in TWS?
How can I add a Condition to a pending order?