@RikD Bill doesn't need the file to acomplish any task, just I want to stablish a relationship between a bill and a file. But the bill doesn't need a file to pass from created to paid or some other task. But if I only should to use the file with bills if a bill needed it to acomplish a task, how could I set the relationship between the file and the bill? I need another domain for that, whick task is to create or delete a relationship between the bill and the file?
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