How can we stream from one database to two targets when the two targets are on different servers but share the instance name?

We stream from a Windows Oracle RAC to AIX Oracle Reporting Server.  Our set up is as follows:

Source Database:
Oracle two node RAC on Windows
Servers:  RACSRVPROD1 & RACSRVPROD2
Instances:  RACPROD1 & RACPROD2


Target Database:
Oracle single instance on AIX
Server Name:  RPTPRODSRV
Instance:   RPTPROD


This has been working fine.

We created a 3rd server (aix) which will become our new production server called RPTNEWSRV.
We want to keep the same Instance name of RPTPROD on the new server.  We used RMAN to duplicate the RPTPROD instance to the new server so all target stuff is set up the same.

Now we want to add this new instance to the streaming environment.  

Obviously we want to make sure the Source database can distinguish between the RPTPROD instances on each server but aren't entirely sure how to do this.

Here are the tnsnames.ora entries in the source server to the two reporting instances:


# Current production
RPTPROD =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = RPTPRODSRV)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = RPTPROD)
    )
  )

# future production
NEW_RPTPROD =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = RPTNEWSRV)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = RPTPROD)
    )
  )


Then we create a new dblink to point to the new server:


CREATE DATABASE LINK NEW_RPTPROD.domain.name CONNECT TO STREAMSADMIN IDENTIFIED by xxxxx USING 'NEW_RPTPROD';

But when we select from the dblink, we get the following message:


SQL> SELECT * from dual@NEW_RPTPROD.domain.name;
SELECT * from dual@NEW_RPTPROD.domain.name
                   *
ERROR at line 1:
ORA-02085: database link NEW_RPTPROD.domain.name connects to
RPTPROD.domain.name


Obviously we aren't understanding something here.  

How can we stream from one database to two targets when the two targets are on different servers but share the instance name?