Thank you Ashish. Unfortunately, I tried your recommendation, but it did not work. In fact, I was not surprised because as far as I know coupled behavior means "same DOF solutions" but is clear from the picture above that edges B3 and B4 have not the same DOF except RZ. I also noted that in your picture DOF selection was left to "program control". I have tried that option and also the manual option with RZ active only, but the results are far from the expected (B3 and B4 straight and in parallel). Is there any other recommendation? Thank you