[CentOS] Kickstart stops with dialog about which networking device - how to avoid

Using a kickstart file that stops with a curses dialog "You have multiple
network devices on this system.  Which one do you want to install through?"

The machine being configured with PXEboot has two ethernet interfaces.  What's
missing from the network entries below?  I'd like this install to proceed
without asking which ethernet interface.

PXE begins the install with DHCP, so Kickstart should already know which of
eth0, eth1, etc. to use.

Here is the ethernet line in the ks.cfg file:

    network --device eth0 --bootproto dhcp

Any ideas appreciated.

=======Keith