When is a Basic Inventory not a Basic Inventory?

Today is riddle day. So here it is in full:

When is a basic inventory not a basic inventory?

When it's a custom inventory!!!

So, now this explains why we are getting thousands of customer inventory every day at my customer. The custom inventories are generated by VBS and as documented here on Connect [1] (and I'm sure in much of the product documentation) we generate NSE's with a msgTo element pointing to the Basic Inventory Dataclass:

'----------------------NOTIFICATION SERVER ENTRY STARTS HERE------------------
dim nse
set nse = WScript.CreateObject ("Altiris.AeXNSEvent")
nse.To = "{1592B913-72F3-4C36-91D2-D4EDA21D2F96}" 'Never change this guid, it is needed by NS.
nse.Priority = 1
dim objDCInstance
set objDCInstance = nse.AddDataClass ("{8284a0ad-b37f-4c9b-b0ad-cb92f97d7401}") ' Change this to math the guid of the custom data class
dim objDataClass
set objDataClass = nse.AddDataBlock (objDCInstance)

Remains to see what can be done about this, so we have event data logged on the Evt_NS_Event_History showing apples for apples, and not custom inventory as basic inventory...

[1] https://www-secure.symantec.com/connect/forums/problem-about-custom-inventory