This bug is found for all Binding Components.
Steps to Reproduce:
1) Create a Bpel module
2) Right click on Process Modules
3) Create a WSDL Document
4) Select a Abstract WSDL and click on next.
5) Select Oneway and change the part name to input
6) Click Finish
7) goto Binding node right click and add binding
8) Select JMS Binding Component or SOAP and click on next
9) Select Add binding to Service port check box.

you can see the error message "Binding "newWSDLPortTypeBinding" already exists"
even after deselecting the checkbox "Add Binding to service port" the error message won't disappear and the "Ok" 
button is disabled all the while.

If the "Add Binding to service port" check box is enabled and if we select any other Binding Subtype the error message 
is gone which is not a correct validation.

This is common bug for all the Binding components.

Build#20080921-1003