OK (pm boxes are empty now 
sorry)
OK I get it Thank you for answer.
(To others I saw this video https://www.youtube.com/watch?v=AzYotTZVhcM - where BVH was retarget with constraints, that seems to me more flexible for ability to modify animation later. MakeWalk assigns a f-curves to related bone, so bone adjustment is possible by rekeyframing frame by frame.)