Hi Team,

I’ve encountered a serious issue with the SmartAPI cancelOrder API, which fails to cancel pending STOPLOSS_LIMIT orders, even though the same orders can be cancelled manually from the Angel One app or web platform. Mainly during after market hours

Problem Description:
When I attempt to cancel a STOPLOSS_LIMIT order using:

cancelOrder(orderid='XX', variety='STOPLOSS')

I consistently receive this error response:

{
  Response: {'message': 'Internal Error', 'errorcode': 'AB2001', 'status': False, 'data': None}
}

I also tried fallback varieties 'NORMAL' and 'AMO', but the result is the same.

Things I’ve Verified:

• orderstatus is 'open'
• ordertype is 'STOPLOSS_LIMIT'
• variety is 'STOPLOSS' (as returned from orderBook())
• I’m using the correct orderid
• Manual cancel via Angel One web/app works perfectly
• Tried multiple orders, same result

Sample Order Details:

{
  "orderid": "XXXXX",
  "variety": "STOPLOSS",
  "ordertype": "STOPLOSS_LIMIT",
  "orderstatus": "open",
  "tradingsymbol": "NIFTY03JUL2526000CE",
  "producttype": "CARRYFORWARD"
}

Expected Behavior:
The API should cancel the order just like the app or terminal does.

Actual Behavior:

• cancelOrder() returns AB2001 Internal Error
• Order remains open
• Can be cancelled only manually (which defeats the purpose of automation)

Suggested Fix:
Please investigate and resolve the internal mismatch that’s causing cancelOrder() to fail.

Request:
Kindly escalate this issue to the backend/API team. It affects automated risk management in live markets, where SLs must be cancellable in real-time.

Thank you,
Ranga