I think you need to use Scenario control as start event in the MH202. I have not used the items under 'Scenarios' as in your screen shot. When I asked BTicino, when they used to actually respond to posts, they said that the different scenario types are to support legacy products. Don't worry about them. You need to use the items listed in 'Scenario control' I use both CEN and CEN plus depending on... for phone use CEN Plus, for MH202 to MH202 and screen10 to MH202 I use CEN. They are slightly different in setup up but slightly.
For MH202 one scenario calling another, use CEN and pick and address and button 0 to use as start condition and then in another scenario use the same as an action.
For Phone app to MH202. Use CEN plus as start for a scenario choose address and button. On phone choose the same.
For screen 10. I found CEN works but there are additional options on the screen10. You can enter a CEN as start, stop, enable and disable. Now when you check the Scenario button on the screen there are four options Start, stop, enable, disable.. Like my phone app and I assume this works like the web interface for the MH202 too. I have not had time explore it much. I should get to this next week and will post more to discuss what I find.. Blind leading the blind
. CEN plus didn't seem to work and for the Screen10 there are additional scenario controls called My-Home-Screen10 scenarios. I thought I saw when I first checked it out it was possible to create these directly on the panel but now that doesn't seem to work. Maybe I am going crazy!!
Just in case you didn't realise it. First for the screen 10 you need to create an object for the Scenario.. Add object in Functions, Scenarios. When that's done you can drag that object on to a room page under 'Rooms' You can also add a shortcut onto the home page from the configure items box on the right. This home page shortcut doesn't show the other buttons, like for rooms, for start, stop, enable and disable but seems just be the CEN command setup as 'start' for the object. Again I need to do more testing.