We will investigate the issue with OracleDataTable and notify you about the result.
As a workaround, please use System.Data.DataTable and fill it with data using Devart.Data.Oracle.OracleDataAdapter.
OracleDataTable :: The method or operation is not implemented
Re: OracleDataTable :: The method or operation is not implemented
dotConnect for Oracle v9.11.1034 successfully works with your scenario. Please upgrade.