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GWT RequestFactory with() method to load nested property which is a Set returns one object only

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I'm using the RequestFactory with GWT 2.4.0 for the communication between client and server and ran into the following issue:

Consider four entities

Here is the code which loads the User. The 'role' has three 'usecases' beeing returned by the server side method.

Everything seems to work perfectly, but at a closer look 'role' contains only one 'usecase' instead of three. I looked deeper in the GWT Code and observed that the data returned to the client contained everything as expected. The requestContext of the class contains 5 proxies.
- 1 UserProxy
- 1 RoleProxy
- 3 UseCaseProxy

So, still correct. But in the decode method of the EntityCodex, something seems to go wrong, since the returned object only contains 1 UseCaseProxy anymore.

Does anyone have experience with this? Any help is appreciated
Thank you
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