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How to define an interface function that returns a value?

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    How to define an interface function that returns a value?

    When I define an interface function that has a return value I cannot create a triggering event for its implementation.
    Instead it appears a regular function in my event graph.
    I understand the logic behind it because the function communication is implemented using message passing and not direct function calls.
    The problem is that this function is never called if I call it from another blueprint.

    So the question is How to define an interface function that can return a value?
    Thanks
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