Differentiating between OEM and Full Product

Differentiating between OEM and Full Product

We have a number of desktops and servers that are a mixture of OEM windows and open licence.
 
Desktop Central shows them as the same, ie. XP Service Pack 3
 
We need to be able to monitor licence usage of both.
 
Have i missed something here or is this not possible?

                  New to ADSelfService Plus?