How i can setup Beam Start/End from particles. Niagara

Hello.
I trying to implement lightning from point ot point in niagara. In cascade i can setup this with using Source and Target Module. BNut in niagara i cant find a way.
I setup system with 3 emitter -2 for source location and 1 beam emitter.
Then i setup event reciver in beam emitter and try to set postion parament in Beam Setup module in emitter swection.
Editor see parametrs but beam dont react on them.
How i can sent particle postion from events to beam End/Start ?