Ok. I can’t find out by answers posted nor by myself. 
I have 2 Actors. And I want them to communicate while constructed(Construction Script).
I can compile, but that’s not enough to communicate. 
So here the origin:
Actor: Hurdle, this one has a Component of the Actor Checkpoint.
And wants to set the variable “CheckpointNumberExt” in Actor Checkpoint.
Therefore I created an ObjectVariable named “CastToCheckpoint” and the VariableType is Object - default Value the Checkpoint Actor.
But this cast always fails.
The other way around it is the same.
Lately tried Best way to communicate between blueprints? - Blueprint - Unreal Engine Forums but this won’t help.
Any ideas? Have I missed something (yes, but I need to know what… 
) .
Many thanks in advance.
Cheers!
Tigger
