When the current installation does not contain all the necessary features, or some features of the SAP BusinessObject BI platform (4.0 or 4.1) need to be removed, there is a way to change that without having to uninstall or completly re-install a system.
From the list of installed patches and service packs select the first installation (whether BI 4.0 or BI 4.1) in the example below click on SAP BusinessObjects BI platform 4.0 (this is a bit unkward as your current patch level is SP5 of BI 4.1):
A button showing Change/Uninstall instead of Uninstall will be displayed, click on this button to launch setup:
Instead of the setup for BI 4.0, this will launch the setup for the BI 4.1 SP5 (current service pack level installed from this example), you have to choose Modify, in order to go to feature selections screen:
Feature selection screen will allow you to pick the missing features for the current service pack or patch and not the initial installation (in this example you will install features for BI 4.1 SP5 and not BI 4.0):
Click on next and the new features will be deployed at the current patch or service pack level.