Hello Krzysztof, here we did have to get FM_SERVER_PKG licenses for about a hundreds of MDS ( 92xx/95xx/97xx) in order to activate the DCNM monitoring part.
Someone from Cisco told me that we're in a moment where DCNM Server-centric AND MDS-centric licensing can occour at the same time, especially if HW is got from IBM that doesn't support DCNM Server based licensing...
Hope it helps...
Ciao
Andrea