Code fixes for the i5/OS are provided via Program Temporary Fixes (PTFs). For general information about PTFs, Group PTFs and Cumulative PTF Packages, see Frequently Asked Questions about Domino updates.
For all i5/OS release, check the Lotus Software for IBM i Compatibility Guide(PDF, 87KB) to verify that your level of Domino is supported, and you have the latest Domino updates installed: