CISCO NEXUS 5K - VLAN in allowed list but not in database VLAN

Hello,

Can anyone explain me this ? I can add any vlan in vlan allowed list on interface even if they are not in the vlan database ? Thank you

interface port-channel12 switchport mode trunk switchport trunk allowed vlan 495,3001 vpc 12 N5K01# sh vlan id 3001 VLAN 3001 not found in current VLAN database