Retrieve objects based on entity id

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Hello community,    I am having a lot of trouble understanding how Mendix processes object retrieval based on id.  The way I understand it, whenever we write an XPath constraint like "id = '[%CurrentUser%]'", the object associated with the current User should be retrieve. However, it seems like Mendix thinks differently.  Here is an example of this case, where I am trying to retrieve the 'Trainee' object related to the same Account.      Apparently there is an incompatibility between the 'expression types'. What am I getting wrong here?  I appreciate your help, as this would unlock my further understanding about how Mendix deals with data retrieval. Right now, it feels very random to me :(   Thanks in advance  
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1 answers
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Is Trainee a specialization of Account? Then use the cast activity. If it has an association to Administration.Account, retrieve by association, or if you want xpath, e.g.:

[MyModule.Trainee_Account = '[%CurrentUser%]']

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