Thank you. I was able to see the log.
I attached.[link text][1]
59930-log.txt (6.96 KB)
By seeing the log, I figured out what the problem was.
Situation 1. (with unchecking “IsConsumable”)
as that log showed, the transaction’s result(Success) and UE4’s result(Failure) didn’t correspond.
Situation 2. (with checking “IsConsumable”)
Everything was OK, It worked as expected.
The problem only happens with Unchecking “ISConsumable”, I guess.