setup-storage and preserving partitions

[Andreas Heinlein]

Hello,

I am still having problems understanding preserving partitions with
setup-storage. I'd like to preserve a partition upon reinstall, and
create it during initial install. Disk config looks like this:

disk_config disk1 disklabel:msdos bootable:1 preserve_reinstall:7
primary    10240    /    ext4    rw,errors=remount-ro
logical    2048    swap    swap    -
logical    1024    /tmp    ext3    defaults
logical    1024-    /media/daten    ext4    acl

Preserving works when installing without "initial", but when installing
a new machine with "initial" Flag given, setup-storage still complains
that /dev/sda7 cannot be preserved because it does not exist, instead of
creating it.

Thanks,
Andreas