Sometimes new operating system versions come out and ITCA/ITCM does not have the information required to properly classify the operating system as it does not match any existing OS Profiles in the MDB database or is not defined in the current \CA\DSM\AGENT\OSCONFIG.XML file...or sometimes both. The prior is addressed by new signatures and data published by CA Technologies and downloaded via the 'Software Content Downloads' engine task populated into the 'System Engine' by default. This combined with OS Definitions in OSConfig.xml allow any supported OS to be detected and reported properly.
Windows 10 Pro Workstation systems version 1709 and possibly others.
Missing MDB data because of unused or non-functioning Software Content Downloads can be corrected separately, but even if that is up to date, this alone cannot resolve the issue in this case.
Windows 10 Pro Workstation introduced changes that prevented it's proper detection by the product, instead causing it to be reported as 'Unclassified' because the existing OSCONFIG.XML file in ITCA / ITCM 14 SP2 (14.2) does not contain the proper additional required structure to detect Windows 10 Pro Workstation, due to changes made by Microsoft to the OS.