Remove VLAN Routing PowerConnect 6248

I'm changing the layer 3 interfaces to layer 2 and even though I have removed the IP addresses from the VLAN interfaces, the switch will not remove the "vlan routing X" statements from the config.  The only thing that works if I completely delete the VLAN from the database.  Are there any other options?

Config:

!System Software Version 3.3.11.2

vlan database
vlan 30

vlan routing 1 1
vlan routing 30 5

interface vlan 30
name "vMotion"
exit

Error when removing the routing:

console(config-if-vlan30)#no routing

Could not get the internal interface number associated with the Unit-Slot-Port.