Cannot update limit price of Combo order

Hi, I have no problem creating and cancelling a limit combo order. However, whenever I try to modify the price, I’m getting

Error 105, reqId 5: Order being modified does not match original order.

Here is a code snippet for reproducing the issue:

from ib_insync import *
import datetime
import logging

def update_order(ib):
  spxw_contracts = [
      Option('SPX', '20220617', 1100, 'P', 'SMART', tradingClass='SPXW'),
      Option('SPX', '20220617', 1000, 'P', 'SMART', tradingClass='SPXW'),
  ]
  spxw_contracts = ib.qualifyContracts(*spxw_contracts)
  combo = Contract(
      secType='BAG',
      symbol='SPX',
      exchange='SMART',
      currency='USD',
      tradingClass='SPXW',
      comboLegs=[
          ComboLeg(
              conId=spxw_contracts[0].conId,
              ratio=1,
              action='SELL',
              exchange='SMART'),
          ComboLeg(
              conId=spxw_contracts[1].conId,
              ratio=1,
              action='BUY',
              exchange='SMART'),
      ])
  order = LimitOrder(action='BUY', totalQuantity=1, lmtPrice=-1.45, orderRef='spread_p_0.02_sto')
  trade = ib.placeOrder(combo, order)
  ib.sleep(5)
  order.lmtPrice = -1.40
  trade = ib.placeOrder(combo, order)
  ib.sleep(10)
  print(trade)


ib = IB()
ib.connect('127.0.0.1', 4001, clientId=37)
util.logToConsole(logging.DEBUG)

update_order(ib)

Even if I commented out the line of order.lmtPrice = -1.40 I still got the error message.

I’m using

ib_insync: 0.9.70 (this is also replicable in 0.9.66) tws_gateway: 10.15 (this is also replicable in 10.12)

Any thoughts? Thanks!

[volconst]

@4everlove , comment/remove the line specifying tradingClass=‘SPXW’ for the BAG contract

[rundef]

@volconst 's solution works

Here’s my code:

order.lmtPrice = -1.40
trade = ib.placeOrder(dataclasses.replace(combo, tradingClass=''), order)