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first of all, Oracle 10gR2 is out of premier support since more then a year - so if you hit a unkown bug or other issue there's no fix without extended support purchased extra.
Next, EF/LINQ is supported only by ODP.NET 2.112.3 / 4.112.3 and later shipped with Client 184.108.40.206 or
ODAC 11.2 Release 4 (220.127.116.11.0)
So - Oracle 10gR2 shipped ODP releases do NOT support EF/LINQ. Sorry