Where can I get more information on what the upgrade does in the various upgrade phases (ABAP)?
An overview of all upgrade phases is available in the htdoc subdirectory of the upgrade directory. You can also create the phase lists yourself by using the htmlphl option to call SAPup. The files are then saved in the current directory, or – if you are calling SAPup from the Upgrade Assistant – in the tmp directory. Upgrade phases that require user actions are described in detail in the Component Upgrade Guides for the different components. The upgrade guides are available as pdf-files in SAP Service Marketplace (Quick Link instguides).