One tedious part of upgrading from Release 11i to Release 12 just got a lot easier: identifying patches for the upgrade process itself. These pre-install patches help you avoid certain upgrade script
The new Oracle E-Business Suite Pre-install Patches Report provides a single list of essential patches that you must apply in pre-install mode before upgrading from Release 11i to Release 12.1. This report serves as a single point of reference for upgrade-related patches that can ONLY be applied prior to running the main upgrade driver for Release 12.1. The report also includes links that take you directly to the patches you want to download.