Overview form for a process



I would like to create an overview form to display the business variables attached to the process.
All works fine, except when the process is complete, I can't see anymore my variable.
I can't see the link between process instance and business data...I see that my process is stored in a archived table and I can access with :

When I'm in the overview page when the process is completed, I can see in the URL :

=> but in the page when I want to retrieve the id (declare a variable caseId of type URL with value = id) : if i display the variable, I have caseId = 7154 => this is not what I've asked ;-(

Can you help me to display information linked to a case when the process is completed ?

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