cannot create sample web service with an existing name in a different package

-have a dynamic web project
-create a default sample web service
-open the sample web service wizard again and set:
set class name to: "HelloWorld"
set package name to: "x.y.z"

=> wizard says that class HelloWorld already exists but what I'm trying to create is file "x.y.z.HelloWorld", not "org.jboss.samples.webservices.HelloWorld"