err: No source code is available for type ejb.entity.Item; did you forget to inherit a required module?

[AlfaOmega83]

Hi all,
i've done all the tutorials that i found on this site. Now i'm trying
to use the gwt with ejb entities.I know that i have to modufy the
*.gwt.xml file in order to make GWTcompiler to see my entity class.
Here's my project (using netbeans 6.7,gwt 1.6.4 and EJB 3.0)

GWTApplication-ejb
|
|-sourcepackage
|-ejb
|-Entities.gwt.xml
|-entity
| |-Item.java
|-session
|-ItemFacade.java
|-ItemFacadeRemote.java
|-ItemFacadeLocal.java

this is the Entities.gwt.xml file :

<?xml version="1.0" encoding="UTF-8"?>
<module>

<inherits name='com.google.gwt.user.User'/>
<source path="ejb/entity"/>
<source path="ejb/session"/>

</module>

GWTApplication-war
|
|-sourcepackage
|-org.yournamehere
|-Entities.gwt.xml
|-org.yournamehere.client
| |-GWTService.java
| |-GWTServiceAsync.java
| |-MainEntryPoint.java
|-org.yournamehere.server
|-GWTServiceImpl

this is the Main.gwt.xml file :

<?xml version="1.0" encoding="UTF-8"?>
<module>
<inherits name="com.google.gwt.user.User"/>
<inherits name="ejb.Entities"/>
<entry-point class="org.yournamehere.client.MainEntryPoint"/>
</module>

when i try to compile this error appear : No source code is available
for type ejb.entity.Item; did you forget to inherit a required module?
i searched it in this forum and tried many solutions but nothing
works.I know that is a very common request but i'm blocked.
thanks