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Instrument Transformer Correction (ITC) - Did someone have an application note about this feature?
Metering & Power Quality
Schneider Electric support forum about Power Meters (ION, PowerTag, PowerLogic) and Power Quality from design, implementation to troubleshooting and more.
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The best document you'll find on this topic is the ION Reference (where all ION modules are explained).
Look on page 355 to 360 where the ITC module is described.
To check if the measurement is right you need to have a "witness" meter (same accuracy as the ION meter) and use CTs (or PTs) that you trust are accurate and can be fairly compared with the "corrected" CTs (PTs).