The error message requires the user to "assign an additional exchange to this instrument" but the users simply do not have the time to enter the exchanges for thousands of instruments.
The real question is: how can we add in NinjaTrader all of the exchanges that we can access in InteractiveBrokers? Please do not require me to add the exchanges for each instrument individually because this would take 100 years. I need to add the list of exchanges once and make them available to all of the instruments.
Also I looked up the link you provided to the helpGuides but there is absolutely nothing in the helpGuides on assigning exchanges. Please do not avoid the question again by referring to documentation that does not exist.
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