Solution : https://service.sap.com/sap/support/notes/583262 (SAP Service marketplace login required)
Key words : 
rss_template_instantiatersinf_refpoints_condense_tmplcheck report   rscds_bad_coding-----------------------call transaction se38, attached reports zrsinf_refpoints_condense und zrsinf_refpoints_condense_tmpl, -cumulative cubes grid points informix reason, 40 million rows takes 5 hours, duplicate grid point rows, error e_multiple_updatesother terms partitioned, display report 'rscds_bad_coding', grid point rows, duplicate grid points, multiple grid points
Related Notes : 
       
| 601024 | SAPBWNews BW 2.1C Support Package 28 | 
| 583267 | Incorrect condensor template, Informix | 
| 571698 | SAPBWNews BW 3.0B Support Package 15 | 
| 539817 | SAPBWNews BW 3.1 Content Support Package 02 | 
| 523249 | SAPBWNews BW 3.0B Support Package 12 | 
| 523248 | SAPBWNews BW 3.0B Support Package 11 | 
| 523240 | SAPBWNews BW 3.0B Support Package 08 | 
| 523201 | SAPBWNews BW 2.1C Support Package 22 | 
| 523186 | SAPBWNews BW 2.1C Support Package 20 | 
| 523185 | SAPBWNews BW 2.0B Support Package 28 |