Hello Jürgen,
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Thank you for your reply and apologies for not providing the version number I am using. I can confirm that I am using version 10.30.01 and so it seems that passing an empty string as per the original (and latest) documentation is no longer correct.?
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In this case, would you know what should be passed for OrderCancel instead of an empty string? I searched the latest API documentation in IBKR Campus but I was unable to locate any information regarding the fields of the new OrderCancel class, so I am unable to adjust my call to include the default fields of this class in order to test it.
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I appreciate your assistance with this.
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Regards,
Scott.