You might not be able to modify your order due to the following reasons:
- Order Already Executed: Once the order is executed, no modifications are allowed.
- Order Status Changed: If the status changes to 'executed' before you attempt modification, it cannot be changed. Refresh the page to check the updated status.
- Expiry Day Restriction (F&O): On monthly expiry days, trading in expiring contracts is restricted after 2:30 PM, and open orders are automatically canceled. Modifications are not allowed during this time.
Always verify details like quantity, price, and order type before placing your order.