Solution : https://service.sap.com/sap/support/notes/217397 (SAP Service marketplace login required)
Key words : 
standard b-tree indexes due, terms business information warehouse, previous primary indexing scheme, apo-infocubes secondary indexes, standard infocubes secondary indexes, normal b-tree, transactional infocubes secondary indexes, traditional secondary indexes, provide additional information, customer-specific namespaces
Related Notes : 
       
| 1013912 | FAQ: Oracle BW performance | 
| 427826 | Error during the index handling of APO InfoCubes in BW 2.x | 
| 422320 | E fact table indexes are deleted but not repaired | 
| 407528 | AS/400: DB2/400 indexing Schema of the BW Fact Tables | 
| 389529 | NORMAL instead of BITMAP indexes on E fact table | 
| 356333 | BW: ORA-28604 during query execution | 
| 339812 | Incorrect indexing of F-fact table on Oracle | 
| 335725 | BW (Oracle): Change/restore standard indexing | 
| 328322 | DB6: DB2 UDB EEE Indexing Scheme of BW Facttables | 
| 184905 | Collective note Performance BW 2.0 | 
| 157918 | BW: DB02 shows "missing indexes" |