Thanks again Jürgen for your help and support, it is greatly appreciated.
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I will get my client to check their market data subscriptions again.? We have also put the question out directly to IB support (several days ago), but have not had any responses.
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Too bad TWS is not open source, we could probably find answers to a great many questions by just following the code that produces these (sometimes undocumented) errors.
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Thanks again!
