first try...
root@xxx# delete interfaces vlan unit 1 family inet address 192.168.200.254/24
warning: statement not found
root@xxx# delete interfaces vme unit 0 family inet address 192.168.221.16/24
warning: statement not found
root@xxx# commit confirmed
error: L3-interface is referenced by at least 2 vlans <default> and <PC>
error: configuration check-out failed