Same here, tested with every 8.3.0.x up to 8.3.0.4
I cannot assign a DHCP-Pool to a VLAN:
Error: Command can be executed on master only.
Configuration 7005 => Configuration => Interfaces => VLANS => IPv4
btw:
Creating a new DHCP Pool ends up with "Error! Feature is not enabled in license!" (We are fully licensed!) I can apply "pending changes" anyway.