r12 upgrade path

Prepare the DB home for R12 upgrade:
Oracle 10gR2 Database Preparation Guidelines for Oracle E-Business Suite Release 12 Upgrade (Doc ID: 403339.1).

Upgrade Path for Systems with 11.5.9 CU2 or 11.5.10.2 with a 10.2.0.3 Database

Path E is applicable for E-Business Suite systems already on either 11.5.9 CU2 or 11.5.10.2 and currently running 10.2.0.3 of the database. Systems in this category have databases not yet upgraded to 10.2.0.4, and whose administrators plan to continue using version 10.2.0.3 after upgrading to Release 12.0.4. While this is supported, Oracle recommends that users upgrade the database to the latest patch set of Oracle Database 10g Release 2 available (currently 10.2.0.4).
Path E follows the R12 upgrade path as documented in the Oracle Applications Upgrade Guide: Release 11i to Release 12.0.4. During the Migrate database to Oracle10g Release 2 step in Chapter 3, apply database patches to the existing 10.2.0.3 Oracle home and perform all tasks documented in the patch readmes, before continuing with the standard R12 upgrade process.