NB 5.5 200604270200

Missleading message is displayed when adding elements (top level class or inner
classes) with existing name. It says 'The specified name is not a valid java
identifier', although the identified is OK. It should display something like
'The specified identified already exists'

Steps to reproduce:
1) create new class A
2) add inner class named Inner
3) select the node related to class A in project view
4) form popup menu select Add-> Inner Class
5) in the dialog fill is 'Inner' as the name.
6) press tab 
-> ... invalid identifier message is dispayed

alternative steps:
...
3) select node relata to resource file containing A
4) form popup menu select Add-> Class
5) in the dialog fill is 'A' as the name.
...