During the update, the contents of directory /usr/sap/<SID>/SYS/exe/run are deleted before the new SAP kernel is imported. If you installed additional programs in this directory such as the RFC library, you have to install them again.

During the Preprocessing roadmap step in phase FREECHK_X, you were prompted to protect files and subdirectories that you do not want to be deleted during the kernel switch. This protection could be performed during the update by copying the file PROTECT.LST into this directory.

If you did not use the PROTECT.LST file and if you backed up files and subdirectories of the kernel directory before the update, you can now reimport them into this directory.