RPM limitations at kickstart time?

[Hal Wine <hal@xxxxxxxxxxxxxx>]

with rpm 4.2.3-10 (RHEL 3 ES update 3), I'm seeing rpm database 
corruption when having an RPM install another RPM in a %post scriptlet.

Supposedly, this is permitted since 4.1-1, and it works fine outside of 
kickstart (anaconda).

rpm at kickstart time claims to support the feature (as advertised via 
examination of 'rpm --showrc' output.

Any pointers to solutions? Or documentation of the limitations at 
kickstart time?

Thanks,
--Hal

P.S. Yes, I have my reasons for doing this, and jbj claims it's possible 
:) See http://www.redhat.com/archives/rpm-list/2004-November/msg00020.html