R12 Feature & Issue migration from R11i

Hi,
I've 3 applications running, GL,HRMS,PAYROLL.
What are challenges during migration from R11i to R12?
Please advice.
thanks,

Check Note: 404152.1 - E-Business Suite Release 12: Release Content Documents
https://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=404152.1

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