Problem with casting

I have simple Pawn that folows predetermined path and does nothing else. I call it Moving Target.
Then, I have AI contolled pawn (called NPC_character_AI_v2) that i want to be shooting at Moving Target, using On see pawn as trigger.
Problem i have is with casting. When i cast Moving Target into NPC_character_AI_v2, i would always get fail for some reason.
I tried NOT to connect Object pin on Moving Target to OnSeePawn node but then i have no idea what to pin there.
Any help would be greatly appreciated.
Thanks, H