SEM-BPS how to load additional data for special users at runtime?

Let´s assume you have a transactional info cube which contains SD Data from the source system.

If you want to show additional data, let´s say the attributes of the sold materials which can be read in the table MARA of the source system (provided you use R/3, etc.)

and you only want to show this data for a small amount of users, which need to see it, then i wonder how to do this.

am i right, that i can use the exit functions to init key figures, i.e. i could write some code which connects to the source system over RFC, downloads the data at runtime and presents it at the users excel sheet????

moreover, is it necessary to extend the existing cube, just to achieve this aim?

Message was edited by: Gideon Lenz