Solution : https://service.sap.com/sap/support/notes/388189 (SAP Service marketplace login required)
Key words : 
//sapserv3/general/r3server/patches/rel46d/nt/i386/, bw release###               setuser 'sqllogin'               select 'bwrelease='+release, component='sap_bw'               print 'execution completed successfully', sp_changedbowner 'sa' iv/ problems / additional actions, / important general comments ii/ error, upgrade iv/ problems/additional actions, component='sap_bw'               ###check connect###, prerequisites incomplete upgrade guidelines, upgrade guidelinesiii/ additional actions, bw release### template
Related Notes : 
       
| 390062 | Additional information about upgrading to 4.6C SR2 | 
| 172143 | Eliminatng special DB/DD errors in upgrade to MSSQL | 
| 154686 | Long Datatype Conversion for MS SQL Server |