In the adjustment procedure, ABAP Dictionary objects before the upgrade/Support Package import (old version) are compared with objects after the upgrade/Support Package import (new version). Transaction SPDD guides you through the adjustment process and provides help. If you still need more information on the objects, this is provided in Version Management.
To prevent data from being lost, you have to adjust the new and old versions of ABAP Dictionary objects. You are presented with a list of all ABAP Dictionary objects that have been modified in the SAP System or changed by a customer transport into the SAP System (for example, <SID>K9*). At the beginning of the upgrade, the current version of objects that have been changed by your transports is recorded, to save the old status. Before you can modify newly imported SAP objects, their current state is also stored in the versions database.