Hi, this problem maybe two fold:
Starting in Data ONTAP 8.2 all license keys are 28 characters in length. With an upgrade existing licenses should be unaffected, however if you reapply a license then you must use one of the new ones. The new 28 character licenses for the systems can be found on the MySupport site under My Support > Software Licenses.
It may also be down to supported versions of OnCommand.
For ONTAP 8.2.5 only the following OnCommand versions are supported:
OnCommand Unified Manager Core Package 5.2.2 P2 7-Mode
NetApp Management Console 3.3.3
http://mysupport.netapp.com/matrix/imt.jsp?components=77623;&solution=276&isHWU
Hopefully this helps.
Cheers,
Grant.