Thanks for your quick answer,
I am a bit lost with the language, I am more on the functional side 
In the note I find information about compatibility across different HANA Applications (the white list), but all the applications I am thinking of are inside Hana Live, so no problems here. I am worried about mixing source systems.
As long as I don't add applications outside the white list, am I ok even if I have separate source systems?
thanks a lot,
J.