The Update Installer uses logical procedures when it uninstalls maintenance. These procedures are covered in this topic.
The uninstall command works similar to the stack logic in computer science. In order to uninstall a fix pack, the fix pack needs to be uninstalled in the reverse order that it was installed. The last fix pack installed needs to be the first one uninstalled.
If maintenance packages A, B, C, and D have been installed in that sequence, the packages must be uninstalled in reverse order, such as D, C, B, A. This is true even if these applications are made up of fix packs, interim fixes and feature packs.