You can go to 11gR2 database with you application and keep your repository inside an older database version like 10gR2 or 11gR1.
Colleagues of mine were having trouble saving pl/sql logic and were getting strange errors like "CDD-22202 An error trying to store text". Have to add they were using a versiioned repository. After downgrading to 184.108.40.206 everything works fine again inside the repository.
Thx. Yes that is an option of course. But the dba's prefer to maintain just one version of the database. And when they have to maintain an extra database version which is not certified they will probably not like that.
(of course designer isn't certified as well)
Dou you have any references (metalink) which describe these bugs? And are you aware of a certication matrix?