Solution : https://service.sap.com/sap/support/notes/410277 (SAP Service marketplace login required)
Key words :
tp locksys <sid> sets, command tp unlocksys <sid>, <sid> = system id, terms bas_masterdatabas_xpra reason, problem rarely occurs, field kna1-werks, usr/trans/bin, enable system changeability, 6c support package 26, include support package 26
Related Notes :
| 410175 | SELECT SINGLE with SY-SUBRC=4: Changed Workarea |
| 97032 | Addresses: Preliminary conversion in Release 4.5/4.6/4.7 |
| 48184 | Upgrade: Stopping a running R3up or SAPup |