This issue is addressed in the 10.02.01.PTF_10.2.163 patch for Spectrum 10.2.1.
This issue is also addressed in Spectrum 10.3.0 and higher.
1.Spectrum UIM syncs for virtualization inventory fail when OneClick server tries to fetch vcenter hierarchy from SSDB. This is happening because an event model has an association with either an ESX host or Resource pool.While getting the vcenter hierarchy from spectrum if an event model is found as part of the hierarchy it will be deleted and not reported to OneClick server.
2. Now spectrum will pull hosts and VMs from UIM that have their status as "active". Any previously modeled UIM content in Spectrum will be deleted if the status is inactive or unmonitored.