[wix-users] Unable to Uninstall a Patch

[Ven H]

I am working on a Patch sample using the following link. However, I am not
able to uninstall the patch either from Control Panel or from the command
line MSIEXEC /i "MsiPath" MSIPATCHREMOVE="PathToMSP"

http://petermarcu.blogspot.in/2007/06/wix-building-patch-using-new-patch_29.html

Can anyone please let me know how to successfully uninstall or rollback a
patch?
Note: I have set the AllowRemoval attribute to "yes" in the Patch.wxs file
for the Patch element.

Regards,
Venkatesh