SInce IB does not record trade related information for FOREX we do not provide volume, unfortunately I am not sure what this value is identifying but for further assistance it is essential you contact Ninja Trader for assistance.
To recap Forex does not contain volume, IB does not map any volume related information for Forex to any third party vendor. It is possible Ninja Trader is using this field as an identifier for different information when loading a Forex chart and it may not actually refer to volume data.
Regards,
IB API Support
Comment