2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199858We present a simple solution to the crossing equation for an open string worldsheet reflection matrix, with boundaries preserving a SU(1|2)^2 residual symmetry, which constrains the boundary dressing factor. In addition, we also propose an analogous crossing equation for the dressing factor where extra boundary degrees of freedom preserve a SU(2|2)^2 residual symmetry.14 pages, 2 figures; v2: affiliation correctedHigh Energy Physics - Theorytext