VTL configuration

Hi,

Looking at my licenses on BE2012, I see that Unlimited Virtual Tape Library is licenced (image 01.png).

I configured my VTL with 4 drives. However, I'm always getting the error "Library Expansion Option Violation" (which also shows as installed), stating that I do not have support to configure more than 1 drive (image 02.png)

Why does this happen? Why is BE2012 not seing my library as a VTL, but as a physical tape library? Do I have to do any special configuration?

Thank you