Solution : https://service.sap.com/sap/support/notes/86627 (SAP Service marketplace login required)
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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