Without digging too deep into it, the SSIM no longer accurately supports the use of its own Symantec Event Codes. In many cases, the built in System Queries do not even work for built in log collectors. System queries shouldn't be broken, it sheds light in areas where a vendor should have paid more attention.
If a derived value such as this is to remain useful, it must be maintained. Its absence means that SSIM owners must create their own queries in cases where the Symantec Event Code is no longer a reliable means of querying events.