Connetion of BI 7.0 to external oracle 10G R2 database system

Dear Experts,
We have BI 7.0 system with MS SQL server as database and we want to
connect it to database Oracle 10G R2.For that we followed the following
procedure.
1) In order to connect to the enterprise database, Oracle 10gR2 client
(runtime option should be fine) needs to be installed (you need admin
rights) on the machine where the connection is requested. -->We have
installed it.
2) You should make sure that Database server is reachable from the BI
SAP machine (ping, telnet, traceroute, etc).--> The tnsping is reaching
the database host.
3) Then a TNS connection name needs to be created --> We have created
the same.
Now after doing the above activities when we tried to create
sourcesystem in RSA1 we got the error as :
Cannot acces source system <External_dbname>
In the system log it is giving error as :
Database error 12154 at CON
ORA-12154: TNS:could not resolve the connect identifier
The Tnsnames.ora,Listener.ora and sqlnet.ora files are as follows:
<TNSNAMES.ORA>
tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\client_2\network\admin\tnsnames.ora
Generated by Oracle configuration tools.
ENTPRD =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.190.0.174)(PORT = 1521))
    (CONNECT_DATA =
      (SERVICE_NAME = entprd)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
<TNSNAMES.ORA>----
<LISTENER.ORA>
listener.ora Network Configuration File: C:\oracle\product\10.2.0\client_2\network\admin\listener.ora
Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oracle\product\10.2.0\client_2)
      (PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = EIMREYMDD0.eimskip.net)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
<LISTENER.ORA>----
<SQLNET.ORA>
This file is actually generated by netca. But if customers choose to
install "Software Only", this file wont exist and without the native
authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES = (NTS)
<SQLNET.ORA>----

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