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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 22.214.171.124 or
ODAC 11.2 Release 4 (126.96.36.199.0)
So - Oracle 10gR2 shipped ODP releases do NOT support EF/LINQ. Sorry