Error in the Roemer delay between the MPD and Kerr solutions. We consider a Galactic centre MSP with a_* = 825r_g, i = 76°, ω = Ω = π/4 and eccentricities e = 0.7, 0.8, 0.9 (blue, green, orange lines respectively). Rapid, large magnitude variations are observed as the pulsar goes through periapsis, with the most significant discrepancies – 𝒪(μs) – for the most eccentric systems which probe the strongest gravitational fields.