Connection to 10g database from 10g Developer SQLPLUS

Hi,
I have installed Oracle DB 10g Release 10.1.0.2.0 on Windows XP.
START->ALL PROGS->oracle-OraDb10g_home3
Location of TNSNAMES FILE:
C:\oracle\product\10.1.0\db_3\NETWORK\ADMIN\TNSNAMES.ORA
with two alias:
1)ORCL3
2) EXTPROC_CONNECTION_DATA
I can logon to database via SQL*PLUS and I can log on to EM on the web as well using ORCL3.
After that I installed Oracle Developer Suite 10g 9.0.4.0.1 to my the same computer.
During installation it was not allowing me to install this suite to the same ORACLE home.
I installed this in the following home:
START->ALL PROGS->oracle Developer Suite-DEFAULT_HOME_1
Location of TNSNAMES FILE:
C:\oracle\product\10.1.0\db_1\NETWORK\ADMIN\TNSNAMES.ORA
with two alias:
1) EXTPROC_CONNECTION_DATA
2) ORCL3
Here is the problem whenever I try to logon to ORCL3 via SQL*PLUS 9.0.1.4.0( DEVELOPER SUIT):
START->ALL PROGS->oracle Developer Suite-DEFAULT_HOME_1->Application Development-> SQL Plus
OR to
START->ALL PROGS->oracle Developer Suite-DEFAULT_HOME_1->Designer-> oracle Desiger
I get following error:
ORA-12154 TNS:Could not resolve Service name
I used user
Scott/*******@ORCL3
and I tried this as well:
Scott/*******@EXTPROC_CONNECTION_DATA
I appreciate any help in this matter.
Regards,
Kasher

Depending on the exact client and server versions, that could be a known issue.
See Metalink Note:207303.1 - Client / Server / Interoperability Support Between Different Oracle Versions

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