It took some time to figure out a way to change a variable that’s in a Struct array and this is again in a Struct array. For those who also have this problem I post my solution. I’m looking forward to see maybe better ones because mine is very complicated. 
May be better set members in struct Set Members in Struct: SOLUTION! - Blueprint - Unreal Engine Forums
I was banging my head to sort this out. I’m trying to create advanced mission manager so found the solution in the end. I tested and it works this way and you might find it useful since it is much cleaner setup. Also for other people like me having problem with Nested Struct arrays and for each loops.
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