Solution : https://service.sap.com/sap/support/notes/627764 (SAP Service marketplace login required)
Key words :
se11 > display table > utilities > check database object, fields src_ntab_o = 'x' und multi = '02', basis support package, runtime object version, dictionary source information, symptom table pools, table pools reason, converted table pools, terms unicode migration, table activation program
Related Notes :
| 1319517 | Unicode Collection Note |
| 765475 | Unicode Conversion: Troubleshooting |
| 759494 | RADPOCNV does not correct pool for Unicode |
| 650937 | |
| 548016 | Conversion to Unicode |