Solution : https://service.sap.com/sap/support/notes/86627 (SAP Service marketplace login required)
Summary :
During SAP release upgrades, custom settings in tables T156S, T156N, and T158B may be overwritten, reverting to default SAP configurations. This issue occurs due to the tables' type E, making non-customer entries susceptible to overwriting during upgrades. SAP recommends creating and using custom tables Z156S, Z156N, and Z158B to backup and restore settings post-upgrade. Detailed steps include generating a custom report ZCUSTSAV, saving settings before the upgrade, and reloading them afterward using the same report. Check all entries post-restoration to ensure completeness.
Key words :
directorygeneral/r3server/abap/note, standard sap setting, system log records, system log record, sap fields t156sy, customer fields t156sc, correct field contents, reconverts tables t156sc, standard sap settings, create report zcustsav
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