there are several limitations for the live connection compared with import connection. It also depends on the live connection, wether to BW or to HANA for example.
Have a look into the documentation:
This is a good starting point for all information concerning the live connections in general. You can find for every live connection a link to a support matrix or to known limitations.
Another good source for comparing the different connection types is the WIKI page:
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.