Relationship field in XOR node

Hi! I´m trying to make a logic between a value entered by user in my process model and a related field (linked by relationship). But the logic isn´t working and I dont know how to pass the relationship in the model (as I do easily in the interfaces).

In the first "write records" the relationship appears in the node inputs

But then, when I make the logic in the XOR, the relationship does not appear. Even if I put it manually, the logic fails. What can be causing that? 

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