Problem connecting Discoverer plus to Oracle 10g DB

I have a problem connecting Disocverer Plus to DB 10g.
DB 10g is located on a different server than Discoverer. All windows environment. When I enter DB name it gives me ORA-12154 error.
Question – I searched all the documents and it doesn’t say how to configure DB 10g to work with Discoverer. Could some one help me pointing me in a right direction? Do I have to create Data Warehouse or can I connect to the DB directly.
I added Database connection on the DB 10g listener. Do I have to do it on the BI listener as well. So complicated and no guidance.
thanks

In your Discoverer 10g home, navigate to:
$OH/network/admin
configure your tnsnames.ora alias's
or a shortcut... on Oracle BI Discoverer connection string enter:
username
pwd
db string like this (no breaks):
(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=yourmachine.domain)(PORT=1523)))(CONNECT_DATA=(SID = vis)))
There is guidance. The Discoverer Configuration Guide
or MetaLink Support notes.
The configuration guide specifically documents common problems
http://download-west.oracle.com/docs/html/B13918_03/tshoot.htm#sthref1287
D.1.4 Discoverer reports the error ORA-12154
OracleBI Discoverer reports error ORA-12154: Could not resolve service name.
Problem
OracleBI Discoverer cannot connect to the database alias specified by the connection details.
Solution
Make sure that:
the database alias is in the tnsnames.ora file on the middle tier
the database alias exists in the tnsnames.ora file on every machine that runs sessions
Hint: If you have SQL*Plus (or any other Oracle product) running on that machine, try connecting to the database with that product.
Hope that helps point you in the right direction.
Regards,
Steve.

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