Thanx 4 the reply KeyboardFreak.You didn't offend me, at all. I just received a reply from EPU saying that it was normal(no trouble at all)
The thing was, in Patch mode, holding the PATCH FINDER button and selecting RHY & SFX from the numeric pad, there are these categories: BEAT & GROOVE and DRUMS. If you select any of these with the cursor, and press ENTER, the display reads:CATEGORY NOT FOUND. EPU told me that the XV doesn't come with these categories, but to me it doesn't seemed normal that the factory settings have this option, since the synth itself is not able to locate them or even use them (they don't exist!).
The answer was in knowing the "Roland way" (XV's don't come with these categories but they're already putting their names in them)
Thanx KeyboardFreak