My blueprint interface isn't allowing me to interact to the selected Blueprint

So Here is the problem. I have used this method before just fine. But obviously there is something I am missing in this situation. First of all, I am using the Generic Shooter Sample project sold on the market place.

Now the problem I have is for projectile weapons, the velocity and damage is handled in the Projectile itself, now from what i have been shown before from other tutorials and what i have used is to use my call the interaction event from a message node place in another blueprint anywhere.

this doesn’t seem to work at all… i have simply told it to print string: hello and it doesn’t get that far.
I have tried calling the message node from several different blueprints; from the powerup BP, from the character BP.

does the target input have to be anything specific, or is there a way of getting this to work even easier.

sorry for any lack of information before hand. if anything else is required to know. please request.

Nevermind, someone suggested creating a bunch of children of the projectile bp and just change the Projectile thats being use with the specific settings required. works a treat.

Thought i would post my solution in the event anyone else has a similar problem.