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Still exists in rawhide.

One possiblity.  Don't try the deactivate step, but use a "force" option on
lvremove.  This option will skip confirmation checks if the LV is active, but
before removal will deactivate the LV.  This should be safe as long as the VG is
not clustered.  In the clustered case, the "force" option would also skip a test
for activation on other cluster nodes, which is perhaps not desired here.

I believe this is the code:
<snip>

 def remove_lv(self, lvpath):
    self.deactivate_lv(lvpath) <----
    try:
      args = list()
      args.append(LVREMOVE_BIN_PATH)
      args.append("--force")
      args.append(lvpath.strip())
      cmdstr = ' '.join(args)
      out,err,res =
execWithCaptureErrorStatusProgress(LVREMOVE_BIN_PATH,args,
                                                       _("Removing
Logical Volume"))
</snip>


Other bzs covering same/similar issue:
https://bugzilla.redhat.com/show_bug.cgi?id=248164
https://bugzilla.redhat.com/show_bug.cgi?id=250439

This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.

More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

The bug applies to fedora 10:

Error message:
  lvchange command failed. Command attempted: "/sbin/lvchange -an
  /dev/vg1/lv1-snapshot" - System Error Message:
  Can't change snapshot logical volume "testA1"

Step to reproduce the error (from system-config-lvm):
 * Create a logical volume (don't even mount it).
 * Create a snapshot of that LV.
 * Select the snapshot
 * Click on "Remove logical volume"

The problem also occurs when I run the command line manually
 /sbin/lvchange -an /dev/vg1/lv1-snapshot

Workaround:
 Use the command "lvremove VolumeGroupName/Snapshotname" from the
 command-line.

Created attachment 358065 [details]
Proposed patch

Snapshot cannot be deactivated before its origin is deactivated. Workaround proposed by Frank is correct solution.

system-config-lvm-1.1.8-1.fc10 has been submitted as an update for Fedora 10.
http://admin.fedoraproject.org/updates/system-config-lvm-1.1.8-1.fc10

system-config-lvm-1.1.9-1.fc10 has been submitted as an update for Fedora 10.
http://admin.fedoraproject.org/updates/system-config-lvm-1.1.9-1.fc10

system-config-lvm-1.1.9-1.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update system-config-lvm'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-8861

system-config-lvm-1.1.9-1.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.