I think we have to update the name in the symbol mapping
Tools --> Instruments --> Search NG --> edit --> Symbol Map --> Interactive Brokers
Should we change NG to something like NG|NYMEX||10000?
I tried but the problem still persist. I checked the contract description for NG in Interactive Brokers, it seems that there are two trading class for NG now: NG and HHW. Both of them are traded in Nymex and the multiplier are both 10000. It is not possible to distinguish these two different contract if we just specify the exchange "NYMEX" and the multiplier "10000" in the symbol mapping name. Where should we specify the trading class (which is the only feature distinguish these two) in the symbol map's name? Thanks

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