IBM i v7.4 has now been released for 1 year, was released 21th of june 2019. Attunity Replicate (IBM DB2 for iSeries) do not yet support IBM i v7.4! I've been told that IBM i v7.4 is supported at the earliest in the end of 2020! I strongly recommend to speed up for supporting new releases, not just IBM i v7.4!