Thank you a lot for your response I think I understand better, I try and let you know ^^ A big thanks to you
Yes that was it !!! I feel me so dumb ^^β Another big thanks to you I thing I made a really step in better understanding this engine. thank you thank you thank you !
For the other the solution was to register my players reference of BP_hero in a variable (in the gamemode BP) and make a getter in the BPI of the gamemode. From my affecthealth I can get the object reference of my bp_hero and call back my bpi from another instance.