I have 2 disjoined solids that touches on their edge:
 

I want to create a "round filet" on both sides to join them. The "round fillet" feature didn't work so I did a "revolve boss" to add some geometry. I chose the finishing vector to limit the "revolve boss":
 

The end of the feature isn't applied correctly. So I changed my strategy, I selected a limiting plane:
 

Then is complains that it is impossible to adjust the result with the selected face despite the preview that seems to work!
 

Any ideas?