Solution : https://service.sap.com/sap/support/notes/329195 (SAP Service marketplace login required)
Key words : 
>\<sid>adm'        r3up message  r3up>, usr\sap\put\log\mssdropsapr3, upgrade guide iii/ additional actions, 2002 iv/ problems/additional actions, / important general information oct, login <sid>adm exists, assign sql server jobs, mssql-specific installation note, iii/ additional actions, problems / additional actions
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