We construct the Orlov–Schulman symmetries for the Manakov–Santini (MS) hierarchy. We give an explicit proof of the compatibility of additional symmetries with the basic flows of the MS hierarchy, and consider several simple examples, including the Galilean transformation and scalings. We also present a picture of the Orlov–Schulman symmetries in terms of the dressing scheme based on the Riemann–Hilbert problem.
L. V. Bogdanov (Sat,) studied this question.