There are very specific steps when upgrading an Oracle Applications database. In your case, you will want to refer to the Metalink Doc ID: 216550.1 (Oracle Applications Release 11i with Oracle9i Release 2).
Also, note that only Oracle Applications Release 11.5.7 or later is certified for use with Oracle9i Release 2 (9.2.0). Check the certification matrix on Metalink or OTN to make sure that your platform and environment configuration are certified to work with Oracle9i before performing an upgrade.
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