Hi Mala, here's a version where I cut away some space between the 2 pieces and put in a blend between them so that it will be all smooth.

This version should fillet better:



- Michael

Hi Michael,
fine. Thanks a lot! Didn´t notice this fault in the object.
Your solution opened me the workaround and I made it from new. Not it works absolutely perfect.
Kindest regrards, Mala