You can use a rolling cluster update approach to upgrade from Novell Business Continuity Clustering (BCC) 1.2.1 to BCC 1.2.2 on your fully patched Novell Open Enterprise Server (OES) 2 SP3 clusters.
Section 6.1, System Requirements for the BCC 1.2.2
Section 6.2, Preparing to Upgrade to BCC 1.2.2 on OES 2 SP3
Section 6.3, Upgrading to BCC 1.2.2