How to deal with Multiple Entries for the same host in Grid Control

How to deal with Multiple Entries for the same host in Oracle Enterprise Manager Grid Control 10g.

Steps:

Please find below the steps to remove the host entry. 

Delete targets discovered using the Agent. Targets-->Oracle Applications-->Remove. Wait around 20 min to let it complete.

To view the removal status, click on the global "Setup" link
--> Management Services and Repository
--> Overview page
--> General section
--> Deleted Targets

However,  you can change the host property of an agent through emcli utility . It will not create the duplicate entry.

How to setup emcli:

http://download.oracle.com/docs/cd/B16240_01/doc/em.102/b40004/cli.htm#sthref10

Emcli sample command:

emcli modify_target -name="" -type="" -properties="MachineName=hostname.domainname" -on_agent