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This is Gavotte feature.
The details of use case for this feature is located in WSDL Editor Functional Spec (Gavotte) at: http://alaska.stc.com:10000/alaska/Wiki.jsp?page=WSDLEditorGavotteSpec Search for this bug number and look the description in "Detailed Use case" section.
Select the role widget and press delete key.
Verified on Windows XP with Gavotte build 070115_19 and the following issues: issue 92644 issue 92655