The dynamic program for choice network RM is intractable and approximated by a deterministic linear program called the CDLP. When the segment consideration sets overlap, the CDLP is difficult to solve. A weaker formulation (SDCP+) is tractable and approximates the CDLP value very closely. We show that if the segment consideration sets follow a tree structure, the two problems are equivalent, and give a counterexample to show that cycles can induce a gap between CDLP and the relaxation.