In 2021, the Bavarian State Paintings Collections refused to allow Germany's national tribunal that reviews claims of art lost in the Nazi era to review the case of Picasso's Madame Soler, which the family of Paul von Mendelssohn-Bartholdy had claimed. "It is simply inexplicable that the state should refuse to use a mediation mechanism it established itself", said Hans-Jürgen Papier, the commission's chairman and a former president of Germany's constitutional court.[17]