11g Release 2 is certified with eBS 11i – 11.5.10.2
From October eBS 11i was certified within 11g R2, but checking last information I found that may features still remains underway, I mean, database is certified by not all the features like Dadatabase Vault. In my opinion Oracle had to wait before officially say that database is certified. One more thing, migrate does not mean upgrade database only, ...