Having trouble to delete datasource from JDeveloper IDE

Hi,
I am having trouble to delete datasource from JDeveloper IDE, neither can I change it.
1. I deleted the datasource entry.
2. Then I delete the entry in SIQA-data-sources.xml file in project root directory. SIQA is my workspace.
3. There is no entry in C:\JDev10g\jdev\system10.1.2.0.0.1811\oc4j-config\data-sources.xml where is embedded oc4j server
after close JDeveloper embeded OC4J Server configuration dialog box and reopen it. It will come back.
I have no way to delete it or change database url.
The version I have is 10.1.2.
I hope to hear response asap.
Thanks in advance.
JQ

Delete the JDBC Connection in the Connections Navigator corresponding to the data source.

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