Data grid data source

Good morning! I want to show the attributes of a third entity in a data grid which is only associated to the second entity  that is directly associated to the first one entity (path), like this: TRIDENT_LS.Ticket_Antena/TRIDENT.Antena/TRIDENT.Factura_Antena/TRIDENT.Factura The problem here is I am only able to see the attributes directly associated to the ticket. Does anyone know How I can solve this?
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