A work listed as a viola concerto in B-flat is actually a concerto for clavi-cembalo and piano forte (though only one undesignated part is present). Stamitz did write a B-flat concerto for viola (the viola part is in A-major), but this is not that work.
https://imslp.org/wiki/Viola_Concerto_i ... l_Philipp)
Stamitz B-flat Viola Concerto is another work
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