Entity-framework – Can’t I call a stored procedure from Entity Framework inside a transaction scope

I have a method that uses Entity Framework to do some changes/inserts in different entities, all this inside a single transaction scope. These changes works very well.

My problem has began when I needed to use a stored procedure in the middle of these operations. The procedure does only an insert in one table, and has no explicit declaration of transactions. I've tried declaring a transaction and commiting there also, but the problem was the same.

Can't I call a stored procedure from Entity Framework (EF1) inside a transaction scope?

This exception is thrown only after transaction.Complete(), when the using block is closed.

The transaction has aborted.

   at System.Transactions.TransactionStatePromotedAborted.PromotedTransactionOutcome(InternalTransaction tx)
   at System.Transactions.TransactionStatePromotedEnded.EndCommit(InternalTransaction tx)
   at System.Transactions.CommittableTransaction.Commit()
   at System.Transactions.TransactionScope.InternalDispose()
   at System.Transactions.TransactionScope.Dispose()

Inner exception:

The transaction operation cannot be performed because there are pending requests working on this transaction.

   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)
   at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
   at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
   at System.Data.SqlClient.SqlDelegatedTransaction.SinglePhaseCommit(SinglePhaseEnlistment enlistment)

UPDATE: Started a bounty

Today I'm not doing this procedure call through Entity Framework anymore. I'm calling the procedure through ADO.net, this was my workaround. But the problem continues, I should need make some calls in the near future, maybe inside a transaction scope.