Solution : https://service.sap.com/sap/support/notes/445866 (SAP Service marketplace login required)
Key words : 
upgrade guide additional key words upgrade migration release updates release maintenance level r3up prepare kw, upgrade ----------------------------------------------------------- ix/ chronological summary date topic short descriptionoct/25/01 vii db version, chronological summary----------------------------------------------------------- ii/  important general remarks ----------------------------------------------------------- iii/ amendment, upgrade assistant ---------------------------------------------------------- vii/ problems, long runtimes ----------------------------------------------------------- vi/ problem, important general remarksiii/, db-version, upgrade phases -------------------<d031901, r3up keyword, prerequisites solution caution
Related Notes : 
       
| 335029 | Additions to the upgrade to Basis 4.6D (NDI Upgrade) |