sql-server - SQL Server 2000 RPC inside transaction

Question

I have created a linked server to from SQL Server 2000 to SQL Server 2008 R2. And I am making RPC call inside a stored procedures as below.

--successful without transaction
execute sql2008server.DBName.dbo.sp_in_sql2008 @param1...,@paramn
-- end successful without transaction

This works successfully, however the same RPC call fails from with in a Transaction as shown below.

-- Below call fails
BEGIN TRANSACTION 'someTran'
--some lines of statements
execute sql2008server.DBName.dbo.sp_in_sql2008 @param1...,@paramn
END

The remote stored procedure in SQL Server 2008 has a transaction inside it.

So SQL Server 2000 doesn't allow nested transaction in RPC?

Or it doesn't allow RPC inside a transaction at all?

Any help is appreciated.

Thanks in advance,

Ramesh.