Solution : https://service.sap.com/sap/support/notes/420371 (SAP Service marketplace login required)
Summary : 
      This SAP Note addresses issues related to upgrading an NDI system, identifying potential problems during the SAP Basis System upgrade and solutions primarily via references to other notes. It aims to prevent data loss, upgrade shutdowns, and extended runtime, focusing solely on database-independent concerns. Specific SAP application problems outside of the Basis and post-upgrade issues directly caused by upgrade tools are not covered here. Users are instructed to consult this note, which is regularly updated, immediately before proceeding with an upgrade to ensure the application of the most current advice and solutions.
Key words : 
101902--------------------------------------------------------------------- ii/ important general information -----------------------< d030326 sep/20/02 >-------------------------windows nt, /usr/sap/<sapsid>/sys/exe/run $home, /usr/sap/<sapsid>/sys/exe/run, / r3up keyword -----------------------< d025323 apr/10/00 >-------------------- r3up keyword, long runtimes ------------------------< d001330 20/okt/04 >-------------------------function groups, preparenew dimension system solution important, \nt\<processor type>\ntpatch directory, include basis support package 30apr/10/02, ------------------------< d019512 apr/18/00 >------------------archiving work items, -------------------< d024828 aug/25/00 >------------------------preventing data loss
Related Notes : 
       
| 783308 | TLIBG inconsistencies before the upgrade | 
| 746476 | Export with 'client=all': Data does not arrive | 
| 547773 | SPAU: interface method names are truncated | 
| 537347 | tp writes corrupt buffer line to NT | 
| 512241 | Syntax error in the SAPLTMSC program while upgrading | 
| 498484 | BW extraction: Mult. delta records with qRFC 6.20.043 | 
| 457115 | SAP upgrades and changes in IXOS eCONtext for SAP | 
| 444045 | Views after import/upgrade without join conditions | 
| 394331 | Upgrading to 4.X: Error message with CWB* tables | 
| 339126 | Table conversion error | 
| 329195 | Additional info on upgrading to 4.6C SR1 MSSQL server | 
| 326783 | Additional Info: Upgrade to 4.6C SR1 (DB2/400) | 
| 326658 | Enhancements to upgrade to 4.6C SRx INFORMIX | 
| 325130 | Conversion of Tables EDIDOC & CDCLS, Rel. 4.6C/D | 
| 324521 | DB2/390: Additions upgrade to Rel. 4.6C SR1 | 
| 305570 | R/3 4.6C Installation/Upgrade Thai | 
| 305560 | R/3 4.6C Installation/Upgrade Simplified Chinese | 
| 305533 | R/3 4.6C Installation/Upgrade Traditional Chinese | 
| 305495 | R/3 4.6C Installation/Upgrade Korean | 
| 303559 | Resources not found after upgrade | 
| 302362 | Generic language import: Termination for DB MSSQL | 
| 216843 | Enhancements to upgrade to APO 3.0A | 
| 211340 | R/3 4.6C Installation/Upgrade Japanese | 
| 203256 | Additions upgrade to 4.6C online documentation | 
| 202790 | DB6:Additions to the upgrade to 4.6C/4.6C SR1/4.6C SR2 | 
| 201874 | Additions for upgrade to 4.6C/4.6C SR1/4.6C SR2 Oracle | 
| 197901 | Supplement for upgrade to 4.6C and 4.6C SR1/SR2 SAP DB | 
| 197886 | Upgrade: messages in CHK_POSTUP: BDL*, STSL*, BAM*, SQLR* | 
| 195446 | Storage space required for 4.6C language import | 
| 195443 | Current note on language import 4.6C | 
| 191270 | Activating the indexes for table MLST | 
| 162980 | saposcol for 64-bit Solaris | 
| 159065 | Data selection for work item archiving | 
| 153205 | Direct deletion of type C work items | 
| 148926 | saposcol version 32 or 64 bit on ReliantUNIX | 
| 145291 | Performance of deletion from archive file | 
| 140313 | Phase ACTREF_CHK in PREPARE module act.checks | 
| 140071 | PCON_<rel>: R3up reports termins. in R/3 System | 
| 137607 | R/3 Upgrade Assistant: stack overflow exception | 
| 137599 | NO R/3 Upgrade Assistant on Digital UNIX 3.2 | 
| 137594 | R/3 Upgrade Assistant: no connection to server | 
| 137590 | Starting Upgr. Ass. from within MS Intnt Expl. 4.0 | 
| 137587 | R/3 upgrade Assistant: PREPARE stops | 
| 73999 | Phase PCON_<REL>: TG450 to TG453 | 
| 49545 | Deleting unnecessary work items | 
| 19227 | Open newest saposcol |