Why does my installer always prompt for reboot

I only want to reboot when uninstalling. This is a fragment from my WiX file:

<InstallExecuteSequence>
  ...
  <Custom Action="CleanRegistry" Sequence="7100">REMOVE~="ALL" AND NOT UPGRADINGPRODUCTCODE</Custom>
  <ScheduleReboot Sequence="7200">REMOVE~="ALL" AND NOT UPGRADINGPRODUCTCODE</ScheduleReboot>
</InstallExecuteSequence>

Running the generated MSI produces the following log:

MSI (s) (48:7C) [10:19:29:951]: Skipping action: CleanRegistry (condition is false)
MSI (s) (48:7C) [10:19:29:951]: Doing action: ScheduleReboot

How is it possible that the same condition evaluates to False then True? Does ScheduleReboot ever ignore its condition?

Edit: I am also trying to use the condition REBOOT~="Force" to conditionally execute a command when a reboot has been requested by my customaction. This condition is 开发者_运维问答never evaluating to true and my command is not being run. The property is being set by a call to MsiSetProperty from a custom action. Either this custom action is not working or I have made a mistake in my condition! Any suggestions?

Some action might be setting the REBOOT property. You should be able to see that in the log. The most common reason is probably files in use.

I don't know why the original code was failing but I have ended up settling on the following which only does a reboot on upgrade or uninstall.

<ScheduleReboot Sequence="7200">REMOVE~="ALL"</ScheduleReboot>