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On further checking it seems likely that The Parts are from First Edition and presumably are 101 thru 106. Sonata 1 in the Parts is Sonata 3 in Viola Arrangement Sonata 2 in the Parts is Sonata 1 in Viola Arrangement Sonata 3 in the Parts is Sonata 5 in Viola Arrangement Sonata 4 in the Parts is Son...

The No. 4 in Nos. 4-6 for cello under transcriptions does not seem to be the right duet. It doesn't match the manuscript scan under Parts. I didn't check anything else.