GWT - How to add external java classes from other project to client project

I have a GWT project. Client code is located in the "client" dir. I want to attach an external java classes (mainly DTO classes) that are in a external project (directory). How to configure the gwt.xml file?

I get this kind of errors:

[ERROR] Errors in 'file: C:/myco/project-ui/src/com/domain/core/client/Myui.java' [ERROR] Line XX: No source code is available for type com.domain.client.Dto.SomeDto; did you forget to inherit a required module?

I'll try to be more specific. My workspace structure is like this:

1. MyModel
2. MyDao
3. MyDto
4. MyBf
5. MyCommon
6. MyUI - with myui.gwt.xml

The MyUi is a GWT application. In MyDto I have Java classes that define DTO (data transfer objects) that are common for the other projects. Therefore, I need that GWT takes files from this directory "MyDto" and compiles it as a client code. Is it possible at all? From what I see GWT allows only that the code MUST BE under client directory with GWT project.

I readed on the web and tried to define a module under MyDto project: Dto.gwt.xml in com.domain.client with:

<module>

  <inherits name='com.google.gwt.user.User' />

  <source path='dto'/> --- (to tell GWT to look in com.domain.client.dto package)

</module>

Added the corresponding inherit in Myui.gwt.xml  <inherits name="com.domain.client.Dto"/> and still get the same error.

Thanks for your help.

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