Hi,
If you are filling setup tables without downtime and your delta is initialized then the records posting will happen in base tables and LBWQ.
Base table is different from setup tables i hope you are aware of it.
Now setup tables gets data from base tables ok.
Yes now coming to your point--Definitely duplication is there because same information is getting stored in base tables as well as LBWQ
So for that to avoid impact of duplication you have to have a dso as staging layer in your flow with all the keyfigures in overwrite mode.
I got this blog..Check that out
Hope this helps.
Regards,
AL