Aeotec Nano Shutter with Blinds

Hey everybody!
I have 2 blinds with Somfy motors connected to Aeotec Nano Shutter and I can control them via Vera for open, close, and stop. But I’m not able to calibrate them to stop on positions so if I don’t stop manually, it hits the top and flip. I tried to follow the manual but no chance.
Anyone can help me with this matter?
Thx!