JUNG 535-U5 double impulse switch with Fibaro switching

[jrkalf]

I like the design of JUNG (LS990 series), but I don't want to spend the cash they ask for KNX solutions.
So now that I'm using Z-wave with fibaro FGS221 switches in the wall, I had to find a nice Jung switch to control it.

The supplier advised me to use a JUNG 535-U5 switch with the Fibaro FGS221. Which I bought, but when I hooked it all up, it wasn't working.
After some debugging and putting an electricians screwdriver onto the S1 and S2 port, I saw current was flowing to it. I also noted that the 535-U5 switch was having led control lights. So I removed the two little leds from their socket and voila, all things were working.

Fibaro settings for parameter 13 and 14:
13: ON / OFF = changed position of switch key (bistable switch) (Default)
14: Monostable Switch (Default)