You can configure how a partial fill for a bracket order is handled in the Global Configuration window of TWS. Depending on your version of TWS, click the File (or Edit) menu followed by Global Configuration and select Presets. In the OCA Group area you can choose:
- Reduced in size: Reduces the quantity of other orders in the group by the partially filled quantity of the order. Please note that using this option without overfill protection may likely result in multiple orders being routed to an exchange. This may result in an overfill, or in a rejection in the case of multiple sell orders where one is tagged as "short sale."
- Reduced in size with Overfill Protection: Designed to reduce quantity of other orders in the group by the partially-filled quantity of the order, and specifies that only one order at a time will be submitted to an exchange to avoid multiple orders filling (overfill).
- Cancelled: All orders in the group will be canceled. When selected, "overfill protection" is automatically enabled to prevent an overfill.
More information on OCA Group settings within Order Presets can be found in our Users' Guide.