On my SMP 7.1 SP2 server, I enabled both Full and Delta inventory policies in the SMC. They run as scheduled and complete successfully on the few systems I have with the SMP agent although I noticed that on my SMP server itself, full and delta inventories each run twice (one at the scheduled start time and the second about 20 minutes later). Got this info from viewing the task runs of each policy where the workstations run full/delta only once as expected.
Note that I'm licensed for CMS 1 where the SMP server is the only system with the SMP agent loaded in my environment. Does anyone have ideas on this behavior? Can't confirm whether this double inventory only occurs on servers (not just the SMP server) since we don't want Altiris on these systems.