The breakdown for Rentals United charges, or charges of any booking channel that is connected to Rentals United, is not supported in Guesty.
For each Rentals United reservation, Guesty receives a single number, which is the sum of all the fees the guest paid for in the reservation. Guesty breaks down this price according to user configuration in Guesty.
As a workaround for when this occurs, you can create a manual adjustment in the guest folio.