Unable to do data preview in Calculation view

Hi,

I am building calc view with projections on BSIK and BSAK table. I am doing an union of these 2 tables and joining further with star join. I am able to do data preview on star join, however doing it on union node or projection node doesn't work. Also, I am not able to do data preview on any HANA live content views delivered with simple finance addon. for example,

I have already executed GRANT SELECT/EXECUTE ON SCHEMA SAPHD to _SYS_REPO;